(Having been on Earth for over two years, Tatsu's primal Saiyan mind is constantly observing and learning, not through academic curiosity but through pragmatic instinct. After his father figure Gohan's illness, Tatsu's ingrained survivalist nature seeks a new advantage. He has learned to overcome physical obstacles through brute force and self-inflicted conditioning, and he has learned to protect his family through both brutal and kind acts. Now, his mind turns toward something new).
During one of his restless walks, Tatsu stumbles upon something alien—a piece of a larger, unrecognizable piece of technology. It is a crashed device from a long-forgotten, galactic traveler. For a Saiyan, raised on the planet Vegeta, where technology was primarily stolen from other races, this is a fascinating find. Tatsu, with his keen Saiyan senses, observes the metallic object. It is different from anything he has seen before, filled with strange symbols and intricate wiring.
He is drawn to it, not because it is beautiful, but because it is complex.The cobblingTatsu drags the strange "bawble" back to a cave near the house, a private space away from Gohan's gentle oversight. He retrieves a piece of metal from his own Saiyan pod, which he had learned to destroy but not to fully dismantle. He uses his immense strength and newly refined ki control to meticulously reshape and re-wire the strange technology. His process is entirely instinctive, a combination of brute-force manipulation and an uncanny Saiyan knack for mimicking a concept after seeing it once.
Mimicking technology: He uses the pieces from the crashed device and his own pod, combining them with Earthly elements he finds in the forest. He doesn't read instructions or understand the underlying principles of the technology. He simply observes the patterns and recreates them with his powerful ki. His "battle meditation," now also applied to objects, gives him an intuitive understanding of how the parts should fit together to create a working whole.
The functioning product: The result is not a spaceship, but a cobbled-together "functioning" product, a device of Tatsu's own making. It is a simple tool, a device that uses a small amount of ki to produce a powerful energy pulse, a concentrated, lethal burst of energy. This device, a crude ki-blaster, is a direct reflection of Tatsu's brutal, pragmatic mind. It has no use outside of combat, and it is a perfect weapon for a warrior.A new pecking orderThis technological pursuit becomes the third most important thing in Tatsu's life, a new hierarchy of priorities for the Saiyan.
Family: The wellbeing of Gohan and Goku remains his top priority. His loyalty to his "pack" is absolute and unyielding.
Fighting: His primal drive for combat and self-improvement remains a powerful motivation. He is constantly seeking to improve his own strength and to teach Goku how to be a better warrior.
Food: While food is still important for his Saiyan hunger, it now takes a backseat to his new, intellectually stimulating pursuit. He can ignore his hunger while he works on his device, a testament to the power of this new, intellectual challenge.
Bawbles: The new "bawbles" are a powerful new distraction, a way for Tatsu to exercise his mind in a different way. He does not see it as a hobby or an interest, but as a new form of training, a mental exercise for a warrior's mind.Tatsu's pursuit of this technology is a quiet, solitary pursuit. He does not show his creations to Gohan or Goku.
(This is his alone time, his quiet time, a time for him to apply his Saiyan logic and his developing mind to a new and intriguing problem. He doesn't understand the science, but he understands the power. And for a Saiyan, power is all that matters).