Crouching Moron, Hidden Badass - his over-enthusiasm for trying to be a hero can be more trouble than help, but when he gets serious he can be pretty significant help.
What Could Have Been - Although you wouldn't guess so from the way Sheldon was treated in the show, Rob Renzetti wanted to make him and Jenny a couple.
Determinator - Even after losing multiple times to Jenny even to the point of losing her status as Queen, she still insists on attacking Jenny any chance she gets.
Evil Matriarch - Subverted. She may be evil and the Big Bad of the show, but she still loves Vega (almost to the point of being overprotective, even.)
Ineffectual Sympathetic Villain - Starts off as a huge threat, but becomes an easily dispatched threat later on. This really gets hammered home, though, when she eventually loses her dictatorship over Cluster Prime.
Even Misty Has Standards: Even though she only does hero work for money and sees no problem with meditating while a Killer Rabbit destroys the town, She was clearly disgusted that her former team mates lazed around and actually betted against Jenny as she fought against a Giant Monstrous Frog.
Expy: Her appearance and powers are obviously based on Raven. (The fact that she was part of the "Teen Team" clinches it.)