Cool write-ups. Tweaks you might consider:
1. Most of these folks are single-power-set characters. It's usually worth giving those either Multipower or Versatile. Unless you envision these being used with the "any two power-traits" house rule, in which case: never mind.
2. More than one of them have a re-skinned Growing Doom SFX. Based on my experience playing Sentry as a PC, I caution against this SFX for player-heroes. The effects are pretty sweeping. It's not just that twice as many dice become Opportunities. It's that that also means fewer than half as many dice become effect-die candidates. (Because all the 2s get knocked out of your result as well as all the ones.) Your hero ends up being less doom-haunted than incompetent, IME.