Risa

A kid who ended up transcending spacetime, let’s not forget. Harry Kim spent seven years as an ensign before, going onto an illustrious career of never being seen again, so let’s not get ahead of ourselves…

And keep in mind that Janeway broke the Temporal Prime Directive so many times that enforcement agents had to come from the 29th century twice to stop her and one ended up going insane as a result and tried to erase her from history in several different time periods.

Edit: oh, and before you say, “she defeated the Borg,” yeah, well, not quite. Picard et al had to clean that mess up, too because she didn’t quite finish the job in her last Temporal Prime Directive violation— and who lent a hand with that? That kid he let sit at the helm and his half brother.