I began writing this fanfic a long time ago and have just been sitting here, So I have decided to post it depending on views. I will continue it. In this fanfic, Goku weds Bulma, which centers around the main character, their second-born son, Roku. Goku weds Bulma roughly a year and a half before the 23rd World Martial Arts Tournament. Gohan is born approximately 6 months before the tournament, while Roku arrives 10 months after Goku's victory in the Martial Arts Tournament. After an accident at Capsule Corp labs, I would have Roku Isekai into another multiverse, occurring after the end of Dragon Ball Z and just before the beginning of Super.
Please note that I do not own Dragon Ball or any images used in this fanfiction. Although I wish I did own it, unfortunately, I don't. 😕😟😩
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A year before the epic showdown of the 23rd Tenka-Ichi Budoukai World Martial Arts Tournament, Son Goku and Bulma held a small secret wedding.
Age 755
For the past year and a half, he has dedicated himself to intense training under the watchful eyes of Mr. Popo and Kami at the Lookout, honing his skills and preparing for the challenges ahead. One fateful night, he made the daring choice that changed his future forever. Goku slipped away from the lookout and ventured towards Capsule Corp to meet with Bulma. Bulma had just come out of the bathroom after taking a long and relaxing bath. Only wearing red panties, she saw Goku sneaking into her room through the window.
Bulma was about to unleash her fury, ready to shout, strike, and kick Goku from her room, when he stumbled upon her, topless, freshly out from taking a bath and clad only in her favorite red panties, utterly unaware of his presence. But just as she was about to respond, Goku dashed over and grasped her hands firmly.
Goku reveals his confused feelings to Bulma. Goku struggled to find the right words. He stated for the last year after they separated, she's been on his mind, always thinking about her and wondering what she's been up to. He tried asking Kami and Mr. Popo, but fortunately, they said they couldn't help him and he should focus on his training. So Goku thought that if they couldn't help him, he should come and talk to Bulma. Maybe she knew why it was happening to him. Bulma understood his feelings and jumped on top of him, causing him to fall on his back and kiss him, shutting him up and pressing her breast on his chest.

Goku discovered a new form of intense training he could only do with his future wife, Bulma, that night.

The wedding was small. Only family and close friends attended the celebration. Bulma couldn't believe that five years after they met and went on their adventure to find the dragon balls, she would marry Goku.
Flashback
Her feelings toward Goku started when she asked Sharon to grant her wish, wanting a perfect boyfriend for her. But Sharon denied her wish, stating she had already met her ideal mate. Bulma then asked Sharon who he was, pointing one of his claws at Goku. Goku was confused, not knowing what was happening; he wasn't paying any attention because he was trying to get used to walking without a tail as he kept tripping and falling.
Bulma began to reflect on all the moments when Goku had come to her rescue, pulling her from the brink of dangerous circumstances repeatedly. She was fully aware of the wish that ignited brightly in her heart.
Bulma then gazed up into the dark sky, her eyes locking onto the ominous, glowing red eyes of Sharon. She then shouts with excitement that she wants to be exactly like Goku. Bulma aspired to embody the spirit of bravery, courage, strength, and fearlessness, much like her young friend. But she overlooked the chance to clarify before Sharon how she wanted to be like him. Sharon's red eyes glowed, and a radiant light enveloped Bulma. As the light that covered Bulma disappeared, everyone there began to stare at Bulma, not believing what they were seeing.
Bulma didn't feel different; she kept looking at her hands, wondering if Sharon fulfilled her wish. That's when she noticed a feeling in her lower back. She turned around, and her face went pale. Bulma then let out a scream of panic. She saw something attached to her lower back just above her perfect little butt. She noticed a blue tail now attached to her lower back, just under her waist.
Shortly after her wish, Bulma and Goku found themselves at the Capsule Corp labs. She examined the DNA of herself and Goku and discovered that neither she nor Goku was human. Her whole human biology transformed. She had become an Alien, a mysterious race to her and Goku.
As the day progressed, Bulma decided to accompany Goku to visit Master Roshi and participate in Goku's training. Even though she trained, she never approached it with the same seriousness as Goku. Her only desire was to acquire the skills to protect herself. She thought her mind was the only muscle worth exercising.
A month after the wedding, Goku finishes his intense training with Bulma, which takes every single night for several hours each time and sometimes multiple times a day. He decides to return to the Lookout and continue his training with Kami.
End of Flashback
Age 756
The start of the 23rd Tenka-Ichi Budoukai World Martial Arts Tournament arrived. Master Roshi, Oolong, Puar, and Launch are at the entrances of the 23rd Tenka-Ichi Budoukai World Martial Arts Tournament as they wait for the last two members of their friend's group.
A luxury limousine stopped in front of them when, all of a sudden, the doors opened automatically by themselves. A pair of gorgeous women come out, one with blonde hair and the other with blue hair. Bulma and her mother exited the limousine, walked toward the gang, and greeted them. Roshi then realized Bulma's mom had a one-year-old boy in her arms. When Roshi asked who he was, Bulma presented Gohan, her firstborn.
Goku descended gracefully on Nimbus, and upon landing, Roshi nervously urged him to hurry and register for the tournament, cautioning that the registration booth would close in less than five minutes.
As in the original timeline, Goku won the 23rd after defeating Piccolo. Goku took Bulma and Gohan on top of Nimbus and flew away toward Mount Paozu.
Age 757
Ten months after winning the 23rd Tenka-Ichi Budoukai World Martial Arts Tournament, Goku's second son, Roku, is born. At birth, Goku felt his son's power, which scared and excited him simultaneously. For a brief moment, Goku could have sworn he felt Roku's Ki far away, surpassing him multiple times. If he had to guess, it was at least twenty times, maybe just a little more than that.
Anyone with the skill to sense Ki on Earth experienced that immense and frightening power for a brief moment. Master Roshi had to stop reading his adult magazine as he broke down, sweating after sensing the power.
Yamcha got distracted after sensing the power that, for the first time in his baseball career, he struck out looking.
Krillin was about to have some passionate time with his soon-to-be wife, ChiChi. As soon as he felt Ki, he lost his erection, and no matter how much ChiChi used her tongue, it never came back. Rumors have it that it took months, almost a year, for him to finally have one.
Somewhere in the mountains, the body of an unconscious Tien Shinha was lying on the ground, and standing on top of him was the blonde version of Launch, holding her fist up in the sky. Prior, Tien had confronted Launch to stop following him. He made a deal with Launch, saying if she could land a single hit, he would marry her. If not, she had to stop following him. As soon as the fight began, Tien felt the enormous Ki and froze. Launch saw that, and she put all her strength into one and knocked him out. She then orders Chiaotzu to leave for a couple of days as Launch begins to drag the unconscious body of Tien to a nearby cave and have her way with him.
Raditz Saga: Age 761
Four years later, all of the Z fighters had agreed to meet at Master Roshi Island since none of them had seen each other after the 23rd Tenka-Ichi Budoukai World Martial Arts Tournament. Also, during those four years, Bulma started a project to surprise Goku after hearing him talk about his training with Kami.
As soon as everyone had arrived, Goku and Bulma presented their second son, Roku. Krillin and Tien both let everyone know they got married as well. Krillin married Chi-Chi and Tien with Launch. Piccolo had stopped his meditation after feeling that much power. It shook him so much that, for a brief moment, he lost all of his colors and became an albino. At that moment, he gave up all hope of conquering the earth.
A mysterious fighter appears on Roshi Island, claiming to be Goku's older brother after Goku denies joining Raditz and conquering Earth. Raditz then proceeded to fight all of the Z fighters, beating them all. Raditz gave Goku the option of killing one hundred humans in twenty-four hours, or he would take his two sons with him. Ultimately, Raditz could only take one of Goku's children, thanks to Roshi interfering and helping out Bulma. But in the end, he wasn't strong enough to stop Raditz as he took a sleeping Roku from the hand of Bulma. To Raditz's surprise, he saw she also had a tail, but hers was blue instead of black or brown.
Goku recovered and teamed up with Piccolo to fight Raditz and rescue his youngest son, Roku. During the fight between Goku, Piccolo, and Raditz, a frustrated Roku wakes up due to the noise of the battle. Roku realized he was trapped inside a circular container but pushed over his limit when he saw his father badly beaten. Raditz scouter picked up a rising power lever. A scared Raditz realized the power level was coming inside his space pod. Just before his scouter exploded, a power of 9,001 was registered. Roku broke out of the space pod and flew toward Raditz. Roku punched through Raditz's armor and body, leaving a gaping hole in Raditz's abdomen. Before his death, Raditz warned Goku of two other Saiyans who would be heading toward Earth for revenge, and they were much stronger than him.
The rest of the Z Fighters and Bulma arrived where the fighting took place. Goku was sitting on the ground holding a sleeping Roku in his arms. Piccolo and Goku then explained what happened, letting everyone know that Roku was the one who killed Raditz. Bulma then walked toward Goku and caressed his and Roku's hair. She said how proud she was of all of her boys. As Bulma looked at Roku, she let go of a deep breath she held onto, saying that her youngest was good at only three things—training, eating, and sleeping.
Just as the group prepared to depart, Kami appeared before them. The announcement that the other Saiyans will arrive in a year has everyone on high alert, urging them to prepare for what's to come. Kami gazes at Goku, revealing that there's someone eager to speak with him and help him in training. Goku needs to go with him immediately!
Saiyan Saga: Age 761 - 762
As Goku flies off with Kami, Piccolo executes a wild plan that Piccolo calls "kidnap and train." He decides to snatch up both Gohan and Roku because what better way to prepare for the Saiyan showdown than a little forced bonding time? "Who needs consent when you have a training regimen, right?"
Piccolo swiftly understood that both Gohan and Roku had not only taken on their father's power and determination to train but also carried a touch of their mother's character, particularly evident in Roku. Bulma quickly located her sons, and she began to send in drones at night to deliver essentials to her sons. Piccolo promptly picked up on that and started to destroy them, angering Roku.
Piccolo began to shout at Roku.
"How often do I have to tell you no more hand-delivery packages from Mommy?"
"Hey, you jackass, that drone was carrying a stash of my absolute favorite snacks. Additionally, it came with a matching outfit as well. We feel worn out from the same outfits you've crafted; it's becoming uncomfortable, making my balls itch daily."
Roku couldn't hold his thoughts anymore and let out his frustration. After finishing, Roku flipped off Piccolo with both of his middle fingers.
A year had passed, and the fateful day of the Saiyans' arrival was upon them. The Z fighters mentally prepared themselves for battle against Nappa and Vegeta, while in the other realm, Goku readied himself for his return to Earth.
As the battle raged on, Roku decisively defeated every last one of the Saibaman. Leaving everyone in awe, with only Piccolo and Gohan remaining unfazed. Throughout the past year, they have both experienced the intensity of Roku's abilities in various situations, particularly during those explosive moments when Piccolo dares get hold of his snacks or when he struggles to wake up from deep sleep.
In a dramatic twist, Chiaotzu's courageous effort to offer himself up against Nappa ended in tragedy, marking him as the first to fall in the battle. Nappa stands tall, barely fazed, with only a few minor scratches adorning his back. The remaining warriors triumphed over Nappa through teamwork as Gohan and Roku unleashed their powerful special moves. With a powerful kick, Piccolo sent Nappa hurtling through the air, right into the path of Gohan and Roku, who were ready to unleash their fierce assaults. Gohan unleashes his Masenko while Roku channels the power of the Kamehameha. Vegeta Scouter had registered the power level of Gohan at 5,500 and of Roku at 13,000. Bulma had allowed both sons to train at a young age with Goku.
Time passed, and Goku finally arrived at the battle scene. To his surprise, he saw Krillin, Yamcha, Tien, and Piccolo all dead at the hands of Vegeta. Piccolo took an upfront attack, heading toward Roku and Gohan, sacrificing himself to protect them.
After seeing almost all of his friends defeated and killed, he knew that he wouldn't be able to get revived since Piccolo was dead, which meant Kami was, too. Dragon balls wouldn't exist anymore.
Vegeta dragged himself toward his space pod, desperate to flee Earth. Just as he fought to climb inside, Roku materialized before him, wielding Yajirobe's sword, poised to strike the final blow. Yet, Roku was halted by Goku's heartfelt plea to his son, pleading with Roku to show mercy and allow Vegeta to continue living. Roku swung the sword down, and a piercing scream echoed through the desert. Roku had left a lasting mark on Vegeta's face, and in doing so, he had taken away his right eye. Roku gazed at Vegeta, declaring that from now on, every time he laid eyes on his face, he'd be reminded of who showed him mercy and was responsible for that defeat and how a low-class warrior and his family stopped him and forced him to retreat like a dog with his tail between his legs.
Age 762 Namek/Frieza Saga
Following the intense clash with Vegeta, the surviving Z fighters were confronted by Mr. Popo, who brought forth the intriguing prospect of getting everyone back to life. He revealed the backstory of Kami, prompting Bulma to team up with Mr. Popo to fetch Kami's spaceship. The following day, the remaining team devised a strategy for Bulma, Gohan, Krillin, and Chi-Chi to journey to Namek first, as Goku would still require time to heal his wounds.
ChiChi kept pushing her limits alongside Krillin after they became a couple. As a promise, as long as Krillin had a stable job as a cop.
Bulma commanded Roku to hold his ground, insisting he wouldn't join her on the journey to Namek. Roku insisted, declaring why he couldn't go, but Gohan was free to go. Roku felt a surge of frustration bubbling within him. He hatched a daring plan to stealthily slip aboard his father's spaceship just as it was about to take off.
Weeks had passed since Bulma and her crew set off on their journey to Namek aboard Kami's spaceship and, at last, Goku's spaceship built by his father-in-law. He, too, set off on his trip to Namek, unaware that someone had stealthily boarded the spaceship just moments before takeoff.
In Space
Goku was staring at the control console in the spaceship when, suddenly, he heard a voice coming from behind him.
"Whoa, Grandpa went above and beyond! He even set up a cappuccino and an espresso machine in the kitchen and stereo speakers, and I was for adding a touch of flair to the spaceship."
Goku's eyes widened in surprise as he detected another presence within the spaceship, convinced he was the only one in the spaceship.
"Roku, what are you doing here?"
The five-year-old looked up at his father and smiled.
"What do you mean, what I'm doing here, Dad? I'm going to Namek with you."
Goku wore a nervous grin, his eyes sparkling with nervousness and uncertainty. He could already sense the storm brewing within Bulma when she laid eyes on Roku.
"Didn't your mom tell you to stay and that you couldn't come to Namek? Hold on, is there anyone else around who knows you here? Your Grandpa and Grandma will anxiously await you back on Earth."
"Correction, Dad. Mom said I couldn't join her, but she never mentioned anything about being unable to join you. Also, Grandpa and Grandma are aware of me being here with you. They helped me in gathering my things last night before your departure."
For the next 6 days, Goku and his son, Roku, train using the gravity floor in the spaceship. Goku's power level grew from 8,000 to 100,000 while training at 100x normal gravity, and Roku's power level went from 13,000 to 75,000 while training at 65x normal gravity. Goku didn't let Roku train at 100x gravity due to his age, and his small body wouldn't hold up under that kind of pressure, and they only had a limited amount of Senzu beans.
Namek
Goku and Roku finally arrived in Namek. They quickly head towards the fight between Vegeta, Krillin, and Gohan against the Ginyu Force, except for Ginyu, who had left with the dragon balls to give to Frieza.
Gohan and Krillin joined together and fought both Guldo and Recoome and to his astonishment, Vegeta's fury flared up instantly. He was in disbelief that Gohan and Krillin had managed to take down Recoome, the very foe who had handed him a crushing defeat.
Their short victory ended quickly as Gohan and Krillin fell into the hands of Jeice and Burter.
Goku and Roku burst onto the battlefield just as Burter was about to deliver a devastating strike to Gohan. In a flash, Roku intervened, landing a powerful kick to the side of Burter's head, resulting in a swift and brutal end to the threat and breaking his neck, leaving him alive but unable to move at all. Roku noticed Jeice's expression shift to one of shock and fear, and seizing the moment, he soared toward him, landing a powerful punch right on his nose, shattering it, and sending a couple of his front teeth flying.
Jeice escaped while Goku and Roku were distracted talking to Gohan, Krillin, and Vegeta after they ate a Senzu bean.
Gohan and Krillin took Roku to see Grand Elder Guru to have his potential unlocked. They offered Goku to come, too, but he declined.
Krillin after Potential Unlocked 14,000.
Gohan after Potential Unlocked 42,800.
Roku after Potential Unlocked 583,500.
"Holy shit, I'm stronger than father now. I have the power!"
Roku lets out a mighty shout, a wave of exhilarating energy coursing through him.
Roku, Krillin, Gohan, and Dende departed from Grand Elder Guru's location to go to where Goku was. As they arrive, Roku sees how Vegeta defeats Jeice and finds Goku engaged in battle with Ginyu, but there is something unusual about the situation. Roku perceives the presence of his father, Ki, emanating from Ginyu's severely battered body.
Roku then joins the fight but leaves both Krillin and Gohan surprised as Roku begins to fight Ginyu in Goku's body.
Ginyu, now in Goku's body, quickly understood that Roku was on another level and attempted to swap bodies again. Just then, Goku, trapped in Ginyu's form, intervened between Roku and Ginyu's Ki blast, reverting to his true self. Roku unleashes a powerful blue ki blast, striking down Ginyu in an epic showdown, killing him.
Goku didn't like that his son would take a life so easily.
Dad, I'm open to giving second chances to those who truly deserve them, but for those who have taken or aided in taking countless innocent lives, I will treat them like rabid dogs and put them down.
Roku stated as he stared at Vegeta.
Time Skip
Thanks to Krillin, Bulma discovered that Roku disobeyed her and came to Namek with Goku. She was not happy.
While Goku was in the healing pod inside Frieza's spaceship, recovering, Vegeta decided to nap, seeing that Vegeta wasn't paying any attention to them. Roku, Gohan, Krillin, and Dende took advantage of that, grabbed all the dragon balls, and summoned Namek's Dragon Porunga.
They wish to revive Piccolo and bring him to Namek.
Time Skip
Roku could hold his own against Frieza in his initial form, but everything shifted when Frieza underwent his second transformation. Thanks to the arrival of Piccolo and fused with Nail, Roku, and Gohan. Frieza had no choice but to transform into his third form, resembling a ripped-off Alien's Xenomorph.
In his fourth and final form, Frieza was toying with everyone. Goku emerges from the healing pod inside Frieza's spaceship and arrives at where the fight occurred.
Despite bringing out all his powers and utilizing the Kaio-ken times four, Goku struggles to keep up with Frieza, who barely breaks a sweat in their fight.
A strategy by Goku, where Piccolo would divert Frieza's attention, aided by Roku and Gohan, while Goku focused on collecting energy to form the spirit bomb.
After a few minutes, Goku created the biggest Spirit Bomb and unleashed it upon Frieza. While Bulma and Chi-Chi had been elsewhere, they decided to go toward the fight, believing Frieza was dead.
Gohan, Piccolo, Krillin, Roku, Bulma, and Chi-Chi gathered around Goku, reveling in their win over Frieza, convinced that Frieza was dead and gone for good. But in a heartbeat, the world shifted dramatically. Piccolo suffered a catastrophic Ki blast that ripped through the left side of his chest, leaving him unconscious and once more on the edge of death.
Frieza turned his attention toward the two new arrivals and saw that one of them also had a blue monkey tail, which angered him.
Roku sees that he pushed his mother out of Frieza's attack. Frieza's attack hit him and took him into the sky. Roku knew he was about to die.
"Damd, I should have stayed back on Earth."
Roku, the gaze down, saw his family and friends, then turned his eyes toward Frieza.
"Hey, ugly, I'll see you in hell, jackass."
Right before Roku exploded it into smithereens, he flipped him off, giving Frieza both middle fingers.
After seeing their son die in front of their eyes, something broke inside Goku and Bulma, and an uncontrollable rage and grief burst inside their bodies. The same thing was going through Gohan after seeing his little brother get killed by Frieza.
Roku had appeared in front of King Yama. Roku took in his surroundings and stared at King Yama.
"Yo, you must be King Yama, right? My dad spoke about you when he came here a little over a year ago."
As the tall, dark-brown Ogre looks down from his desk, he sees a five-year-old boy smiling and waving his hand.
"Who might you be?"
"My name is Son Roku. My father is Son Goku, whom you have met before.
"Yes, I remember him. I was surprised he made it through Sake Way and reached King Kai's world."
"Cool, cool, so this is where everyone comes after they die to get judged to see if they go to hell or heaven. Hey, King Yama, I have two questions for you. First, can you point out which way is toward Snake Way, and second, why am I naked?"
When Roku finished asking his question, he disappeared and was back on planet Namek. For a brief moment, Roku sees his dad fighting Frieza, but he looks different. Goku had spiky blonde hair and green eyes. Then he disappears once more and reappears back on Earth, but not just him; there were a lot of Namekians who surrendered him.
Suddenly, Roku saw a blue blur rush toward him and tackled him to the ground. Roku then looked to see who it was to see it was his mother who was crying and yelling at him for what he did and that he was grounded until he was a hundred years old.