[@Aristo] I've actually only been doing fandom RPs for the last 2 years, as those seem to get the most players on RPG. The process with making a proper character sheet for any RP is the same though: just ask for the information you need. While the process is always the same, the information varies from RP to RP. I think that your new/garden variety GMs are mostly to blame for bad sheets. I never encountered it myself, but a friend once joined an RP where they required you to list your character's bra size. There's a possibility this was asked to ensure there's be some variety in the character's "shapes," but it still feels like a very strange thing to ask role-players to list. I'm not sure why my character's measurements are all that important. 

I've always prized keeping backstories secret. I think it makes for more organic role-playing when characters and players can learn about the characters together. Though I don't think a lot of RPs benefit from it. Danganronpa is a court drama style RP, so character secrets are really important. Your garden variety adventurers questing to destroy the evil overlord are typically more interested in an escapist power fantasy than telling stories about characters. 

Meh.