Roleplays where there's a very specific list of characters and their traits.

I see it a lot on this other website I go on.

It's like

Character name//The Nerdy One XDXDXD//female//nerdy, shy, geek :PPP//[whoever they're played by]
Character name//The WACKY ONE!?!?!?!?!?//Male//Crazy!! :P :P Funny!!! Sarcastic!!//[whoever they're played by]

There's usually about 10 characters in these types of roleplays. They're in specific pairs. 

What's the point?