In the future #19, #20 and #16 never exsisted being they weren't created#17 shot Bulma in the futureIn the manga, Trunks was able to turn SSJ before Gohan died but in the anime his death caused Trunks to turn SSJIn the future Trunks was a nice and mannerful kid. But in the present, he is a meschivious brat. It's all because of Vegeta's influence.