Future Gohan Character Facts

Far more serious and aggressive than his present timeline counterpart, Future Gohan is showcased as a twenty-three year old man and is depicted as the mentor of Future Trunks. After the death of his father due to a heart virus and the murder of the Z Fighters at the hands of Android 17 and 18 six months later, Gohan becomes Earth's last line of defense. Now a Super Saiyan, he spends the following thirteen years attempting to take down the androids, all the while training Future Trunks in the hope that he may one day be able to defeat them. 
Due to the apocalyptic world that he spent the latter half of his life in, Future Gohan is shown being very serious and more aggressive than his present timeline counterpart, but does retain his calm and joking nature, much like his father. Future Gohan is shown to be in quite a bit of pain and stress after all the years of challenging the androids alone, and has a sort of "do or die" attitude. 
Future Gohan appears as a tall, stern, and muscular man. He also dons a uniform greatly resembling that of Goku's early uniform, and states that he is inspired to wear it in the hopes that he will one day be as strong as he was. The only differences between his uniform and Goku's is that the sleeves are longer on his, his boots are a dark blue with yellowish stripes on the bottom edges and without the line running in the middle of the boots from top to bottom, and he also wears his own kanji symbol on the back, Han, .Bulma even states that Gohan looked strikingly similar to Goku when wearing this uniform