Mirai Trunks:

This is Vegeta's son, but from an alternate time line, being 20 years in the future. He has more power than Chibi Trunks. The reason being that he was forced to develop his powers because of harsh conditions in the future. His reason for being in Dragon Ball Z was to help Gokou defeat the Androids who are the enemies of his era. He was able to reach a level slighty higher than Super Saiyajin Level 1 by training in the Room of Spirit and Time.