I have indeed done group roleplays before, however I've never been allowed to watch Powerpuff girls
I do know The Lost Hero and Percy Jackson and the Olympians by Rick Riordan
I also know about Madoka Magica, and I love the story behind it where Madoka wants to create eternal peace but even then another grievance appeared only for Homura's pure love and dedication to Madoka falls into Obsession and causes Homura to become the God of Chaos which she refers to herself as The Demon to The God.
I have heard of //.hack but have not watched any of them at present nor do I know the base storyline of it.
For Trauma Center I have heard of the game, but I have not had the luck of playing it, nor have I watched others play it so how the game presents itself in it's entirety through storyline and authenticity in medical facts I am clueless.
In any case, may I ask why you are asking such questions?