This is a version of the popular Pacman Ghost with parametric variables.
It was inspired by http://www.thingiverse.com/thing:557527

You can define it's size and if you want a keychain in it.
You can even add a LED Hole in it so you can put a LED inside it.

There are some ready-made STL models.

You can see the Video of the LED version here.

Yes

Doesn't Matter

0.2mm

10% or 0%