Real N0t-Slime fans will know his legal name is Marianne. N0t-Slime's his professional name like how Snake is called Snake in metal gear but he has a real name but most people just call him snake.

If people do call him by his legal name they just call him Anna. It's not like a deadname or anything he just has a Mandark situation where his parents are free spirit and don't believe names should always be tied to gender. Though even if they did give him a masculine one it'd never hit as well as N0t-Slime.

Nobody really likes using the 0 in N0t and it sort of pisses him off but he's like so chill he lets it go.