Hiro Nakamura

2006: Discovered his powers & embarked on a quest to save the world;
Battled Sylar, accidentally teleported to 1671 Japan
1671: Inadvertently fuelled Adam Monroe’s evil, forced to trap him inside a grave
2008: Lost his powers when Arthur Petrelli absorbed them, regained them months later
2009: Discovered he was dying, tried to use his powers to fix all the wrongs in his life;
Learned to leave certain things alone, eventually cured
Trapped inside a video game by Renautas, freed by Miko Otomo
Teleported to 2014, tried to save Clair Bennet, found her baby & teleported to 1999
1999: Lost his powers, the baby absorbed them, raised the baby, Tommy Clark, himself
2016: Sacrificed himself fighting clones, to save his family