I've been here long enough to list some stereotypes. Whether good or bad, here are some I noticed.
1.The roleplayer
"Hi, my name is [insert name], and I just got my characters approved, so now i'll start roleplaying."
This is a category that most people in this wikia fall in to. I myself am one, and this can be good or bad. For one, the characters may be intentionally under developed at the start, and the roleplays are room for development. This can be good, because it'll contribute to the roleplaying fanbase, which I like.
2.The writer
"I'm not here to roleplay, but here are a few gemsonas I have, and a fanon story"
These are typically ones that actually know how to create good characters and stories. They are a sign of something good in this wikia, and these usually are older than the required age to be here.
3.The fail roleplayer
"hi my name is [insert name] and my characters just got approved so now ill start roleplaying"
These are ones who have no idea how the hell to roleplay, or write in that degree. A few people fall in this category, and usually get angry easily. Their characters are mary sues, and their good roleplaying is near non-existent.
4.The rejects
"Someone from the Steven Univese wikia told me to go here and post my fanfiction here, so here I am. Now bye!"
These are people who were told to go here from the canon Steven Universe wikia. They can range from good to bad, and usually don't stay here for long.
5.The artist
"Alright, I'm making a character. Better make art to follow along with it."
These are the type of guys who like to make hand drawn/other drawn images for.. Well anything. They can range from stuff from MS Paint to literally gods at art. The good ones are the one I respect(since my hands are basically broken.)
6.Character dump
"Alright.. Got finished making this gemsona, now let's start brainstorming ideas for 2 more."
These are the type of guys that have MILLIONS of fan characters. They can range from good or bad, and typically have their characters approved.
7.The Community man
"Hey guys, I just got back from this trip, so now i'm going to roleplay more. Glad that you guys missed me while I was gone, hope we'll have a good time roleplaying again."
These can usually be combined with other stereotypes, and are most of the time likeable. They get along with the users in this wikia, and their writing skills are usually good.
more soon