Jerkass Has a Point: As boring and overly-sanitized as the Learnatorium is, its staff were completely right about Dimmsdale's kids being out of control and needing reining in.
Magnificent Bastard: The Pixies, who actually set up a 37-year plan that manages to perfectly fall into place.
Moral Event Horizon: Given how badly it affected Flappy, the Pixie's 37-year plan could qualify as this for them.
Well-Intentioned Extremist: The Learnatorium staff, particularly Happy Peppy Gary and Betty. Sure, they want to suck all the fun out of everything, but it's out of genuine concern for the kids' wellbeing; they just want them to be safe and under control. Of course, it's implied that the Pixies deliberately cultivated the "extremist" part so that Timmy would rebel against it, setting up the final stage of their Long Game.
The Woobie: Flappy Bob. Poor guy. He was separated from his parents, used and manipulated by the Pixies and lost sight of his roots and true calling all as part of an evil plot on the part of the Pixies. This is one clown who needs a hug and really earned that happy ending.