She appears to have a "darker" alter-ego that can take over either at will or under stressfull situations. (All the heroes seem to be able to tap their powers more easily under stress.)
It's not just that this alter-ego is the dark side she keeps inside, but this ego is also apparently incredibly strong. Remember those bodies that were ripped apart? She might also be invulnerable as well.
I think the interesting part is how the alter-ego has its own agenda and is aware of what's going on, even when Nikki is in control. Is Nikki the alter-ego?
Oh, and I so called that the one brother's powers is controlling *others* powers waaaaay back in E1.
Hiro doesn't do anything for me and the telepath is midly interesting (I like the actor). The cheerleader is my fav as is the elder flying brother.
Seeing him fly -- and the first hero with a visbible/tangible power -- was quite the thrill.
I think I'd like the show more if it focused more on pockets of characters rather than trying to touch upon each of them, superficially, every epsiode. They've
GOT to get these people together. It's like watching paint dry.