He's a man with a pink face that shows more things inside his head.
Method acting is when an actor completely immerses themselves in their role. They, in a sense, become their character. An actor may use method acting to really pull of their character and make it feel as realistic as possible
<span>Dynamic shapes
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A Wacom Tablet, Pencil and Paper, and Photoshop/other drawing programs.
Probably just strapped leggings? I don't think there's a specific name for them.