A police sketch artist, and patriarch of the Powell family. Was just a normal man with a dysfunctional family, until he suggested a trip to Brazil... and the rest, as they say, is history. Currently mainlines as a vigilante.
Achilles' Heel: Jim isn't completely invulnerable. So far the only thing strong enough to actually hurt him is a high caliber bullet fired from close range. Jim tries to block bullets with his hands rather than his head as a result. On the other hand, his bullet catching habits means he also tends to block everything with his hands even force waves and electrical bolts from other supers. Fortunately, these he can stop just as well as he can bullets.
Blessed with Suck: Stephanie, after a close shave with death, had been injected with the serum, which augmented her super speed to the point of allowing her to travel through time. A nasty side-effect of this, however, is that her chromosomes are beginning to decay. As of the same episode she seems to have no control over this, meaning she is effectively cut off from using her powers AT ALL. Of course it resolves itself by the end of the episode.
Calling the Old Man Out: After her parents literally invited themselves over and proceeded to be generally condescending to to everyone.
Fragile Speedster: Somewhat averted; the plasma shield generated by her speed prevents her from major injuries.
Laser-Guided Amnesia: The Watcher wipes her memory of the last three months at the end of "No Ordinary Sidekick."
Jedi Mind Trick: As of "No Ordinary Double Standard" when she used it to save herself and Chris from a mugger. Then she used it on her own father... Sure, it was just to get out of trouble (and maybe as a test), but this may be Foreshadowing a budding super-villain.
Eidetic Memory: Though it only lasts about six hours unless he spends the time to actually learn and retain the material through study.
Heart Is an Awesome Power: Sure, Jim has Super Strength, Daphne has mind-reading and Compelling Voice, and Stephanie can run fast. But JJ's power is definitely the most versatile. He's learned a language in half a day, identified a species of bacteria without a microscope and solved a ten-year murder case. Not to mention being immune to mind-affecting abilities if he thinks about it hard enough. Furthermore, his ability to see physics itself has proven rather useful; he's no slouch in a fistfight because of it.
I Just Want to Be Special: Played straight during the first episode when the others exhibited superpowers and he was still the ordinary kid with the learning disability. Inverted for the next several episodes when he hides his powers so that he can pretend to be working hard in school so that his parents will be proud of him (he thinks they won't be proud of him if he's relying on his powers to succeed).
Fan Nickname: His real name has yet to be revealed (well, unless it really is Joshua...). If it ever will be...
Heel-Face Turn: Though even then, as of recently, he's apparently 'offered' his services to the Powells as they go to him to get rid of Victoria's body. Thus doing for them similar things as what he did for King.
Hidden Agenda Villain: He has not told Dr. King that Jim has powers. Thus far, his stated reason is because he wants to know why Jim and family have permanent powers rather than temporary. Especially since his powers are of the latter variety; he requires injections to keep his.
Bad Boss: Aside from the whole superpowers thing, he had Dr. Chiles, one of his best employees, fired and killed in order to cover his tracks, and attempted to kill Katie in order to keep Watcher working for him.