Do you know what the above user's avatar is?

[Sparks]

I've never seen that character before. In my opinion she looks like a cool wrestler from the 1980s. I'm sorry I don't know!

 

[TheBlueCatMenace]

Derpy Hooves

 

[Servant Snail]

A blue cat

 

[Mike Wheeler]

Hooktail from Paper Mario: The Thousand Year Door. I watched a Let's Play of that game all the way back in 2012

 

[Fizzle]

A dude from a 3DS game. I read it somewhere

 

[MegaBowser64]

A character called GB from some sort of Mario Land 2-themed fangame or fanfiction

 

[Trunks]

Manny-O

 

[Princess Viola]

Drago, I presume

 

[Sally Acorn (Pre-Genesis)]

Some anime girl with green hair? I don't know; the animation style looks like something anime.

 

[Evil Power Flotzo]

The youngest Koopaling.