Super Hero High is a NationStates roleplay, set on a high school for totally normal people. Except they have superhuman powers. And it's in space.The current incarnation (or set of incarnations) started in November 2011, but it began several years before on the evil Jolt Forums. It started off relatively normal, about a bunch of teenagers, and then HOLY SHIT VAMPIRE WAR! In the latest thread, the war against the vampires is almost over, with only small populations of vampires left.
Always in Class 1: Even though the students are of different ages and skills, they still go in the same classes.
Ambiguous Disorder: Bramwell and Makoto both tend to isolate themselves with exceptions for a few people, and it is established as being odd for Bramwell to start a conversation of any significance and is shown having trouble identifying sarcasm. Sakura has a very unstable self-image that is reflected in her Mental World and forced people to the ground due to hearing an explosion for five minutes after the explosion happened in addition to other odd instances and habits.
Ascended Extra: Head of Security Richard Jenkins started out as simply a background character, but has since taken the step into becoming a proper character with both a backstory and some character development.
Military Brat: Bramwell and Makoto are both explicitly revealed to be so in their first appearance. A mental construct of Sakura's reveals this about herself in her Mental World. Benjamin Silva and Gregory Michaels are other examples.
Mind Hive: Antonio has at least nine other personalities.
Mind over Matter: Makoto and Joaquin both are established as telekinetic psychics.
Maisie: Of course I'm excited, who wouldn't be? It's, it's the moon! This is huge. The moon is, like, it's like a whole new planet! We could find aliens or something. This is going to be so cool! Are you going to volunteer? I'm definitely going to volunteer. I really want to get chosen because this is going to be so awesome!
Lilith is a subversion. Omnicidal, literally bloodthirsty... And so ragefueled that her only appearance involved her attacking one of the most powerful Empowered on the planet, with predictable results.