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

[Fizzle]

The HellValleySkyTrees from Shiverburn Galaxy in Mario Galaxy 2 (I 1-Uped all of you)

 

[Smg4]

Sm64 Mario with eyes looking in two different directions

 

[Sweet Snow]

That creepy Easter egg from Galaxy 2

 

[Milo Thatch]

I thought it was a WarioWare character and was correct

 

[Smg4]

Steven Stone from Pokemon

 

[Thomas the Tank Engine]

Those things from Mario Galaxy

 

["Scary" Wolf]

Antoinette Marie

 

[SparksMarioWiki]

An Ember from Paper Mario: The Thousand-Year Door!

 

[Milo Thatch]

Applejack. Or is it the Applejack head winking in Grannies Gone Wild?

 

[Thomas the Tank Engine]

Steven Stone but with the colors inverted

 

[yoshibro75]

......
Marie Antoinette i guess. (also mine is very easy to figure out)

 

["Scary" Wolf]

A Yoshi that doesn't look too far off from the SNES Yoshi's Island sprite.

 

[Wendy O. Koopa]

Hmmm...I'm thinking maybe an enemy from Paper Mario?

 

[Sweet Snow]

One hip Koopa

 

[Thomas the Tank Engine]

Cicada

 

[MegaBowser64]

Only the most hated and loved monarch en la France!

 

[Wendy O. Koopa]

My boss who used to be my father until the gods of Nintendo willed for it no longer to be so and so Bowser Jr. is his only child and I am merely his failure of a henchturtle.

 

["Scary" Wolf]

That one Koopaling that used to have rainbow hair, but now has tall green hair.

 

[Thomas the Tank Engine]

An Ember from Paper Mario/Paper Mario TTYD

 

[Rick the Door Technician]

Marie Antoinette

 

[Sweet Snow]

Backstabbing Egg Wizard

 

[Smg4]

Cicada from Wario microgames or something

 

[Wendy O. Koopa]

Super Mario Glitchy 4's avatar and character

 

[peachie]

Iggy Koopa

 

[Thomas the Tank Engine]

One of the Backyardigans.