Present...
A black haired man was looking at the rippling object in front of him. His once bright emerald eyes looked very calculating and weary but also carried a hint of sadness. His name was Harry Potter. He reflected upon the past several decades after the last wizarding war.
Several years before...
When the dark lord cast the killing curse on Harry, the soul piece was destroyed, But it had some consequences which he did not realize at that time. It seemed that some of Voldemort's personality leaked into him which changed Harry gradually but did not in a bad way. After the war Harry did not go back to Hogwarts for his NEWTS. He retreated to Grimmauld Palace for some lone time to figure out his future, which was unlike him because usually he used to charge blindly into any situation. During the Hogwarts was being rebuilt he started to study some books in Black library. As soul piece him was destroyed he was able to concentrate easily. He attended the funeral of Fred where he felt like an outsider among the Weaselys. At funeral of Remus and Tonks, Andromeda politely informed him that he was not allowed to see Teddy. He was sad to hear that but he understand her feelings. he agreed to her demand but still used to send gifts on his birthday. While Hermione and Ron used to visit him time to time he knew they were busy with their new relationship as well as their own family issues. As he had lot a free in his hands, he used this time to learn magic. First he brushed up his occlumency and found that he easily able to shield his mind and his mind also felt very clear. With new found concentration he started studying starting from seventh year material. He easily understand them. Two weeks before the new term started he went to Ministry and took his NEWTS and easily passed them. He met minister Kingsley there. Kingsley asked him to join the aurors as he had now completed his education. He also offered Harry a secret rigorous training with the unspeakables so that he can be inducted into aurors faster than normal training. Harry agreed to this offer after careful consideration.
When Hermione and Ron came to visit him about returning to Hogwarts he told them that he had already gets his NETWS. they were surprised. Hermione congratulated him but he noticed some jealously in her eyes. When he revealed about Kingsley's offer without secret training part they were again astonished. This time observed the jealousy in both their eyes. THey both left soon. He didn't know why he kept the training from unspeakables a secret from them.soon his training began. It was very though. They trained him in dueling, mind arts including leglimency and enough dark arts. They also trained physically and basics of martial arts. After his training was over he joined the aurors. Because of his commanding and charismatic nature he quickly started to rise through the ranks of aurors and his fellow aurors started respected him more. By the time he was 35 he become the youngest DMLE head and was well respected across the Europe as a powerful wizard.
But he got feed up with his life in Britain, so he resigned from his post as DMLE head and decided to travel the world. He bequeathed the Black properties and money to his godson Teddy and left without seeing him and after saying good-bye to everyone, promising to come back soon which he no intention of, he left magical Britain.
Over the years he traveled across the world learning different magics and meeting different people. He also encountered many dark wizards whom he killed ruthlessly. During his time in Inidia he learned about Parsel magiks. He learned about earth magic from Amazon forest tribes When in Egypt he came across the information about the Veil of Death. He learned that the Veil could be a portal to another world when used at specific dates. The possibilities are endless.
Present....
He returned to Britain two days before. He observed his friends from far. They were living comfortably. He then went to DoM as he was still an unspeakable he allowed access easily. He went straight into the circular room containing Veil of death It was Samhain when the barrier between the living and dead was weakest, He summoned his Gryffindor courage and stepped into it. As Harry Potter at 54 years ceased to exist in the world and his vision went black.