Speculating: Why does only Small Wario keep his mouth closed (from the get-go)?

[tahutoa]

This form seems to be the only time his default expression isn't that permanent grimace (which is actually a thing in real life, believe it or not. My principal from 2nd to 4th grade had her teeth bared like that as her neutral expression and is the sole reason why I didn't find Wario's all that odd).

What are your thoughts and/or theories?

Edit: BY DEFAULT. I mostly refer to Wario Land 1.

 

[Random Adam]

Wario sometimes closes his mouth, too. In most of his Wario Land idle animations, he closes his mouth.

 

[Robin]

This form seems to be the only time his default expression isn't that permanent grimace (which is actually a thing in real life, believe it or not. My principal from 2nd to 4th grade had her teeth bared like that as her neutral expression and is the sole reason why I didn't find Wario's all that odd).

What are your thoughts and/or theories?

That's actually not true, if you remember, in Wario Land 3 and 4, if you wait a bit still, Wario will close his mouth. Furthermore, we have Puffy Wario where he keeps his mouth closed and maybe Ball o' String Wario (in your profile pic) where we don't know if he's doing the grimmace or not.

 

[Random Adam]

Ohhh, ok. He probably has a grimace just to make him look more imitating, or villainy. Aside from that, the only choice is to look more weird, or strange, which is pretty fitting for his personality.