To the best of my knowledge:

Skibidi Toilet is getting a movie.

Ben10 despite it’s financially proven track record (per the meme) has not received a feature-length cinematic release.

Yes, up to 10 per server, and you could have characters on multiple servers.

I remember seeing the term even while playing pre-WoW MMO’s

I always remember “toons” referring to your character, rather than your account. Kind of like the “cartoon character” you’re playing is how I understood it.