Originally Posted by Alex IDV
Blue is the complete opposite of red if I remember correctly from my Arts class in school - this will ensure that he'll stand out.
On the colour wheel, green is the complete opposite of red. As LeChuck's skin was green already, and yellow would just look silly, they decided to take the hint from SMI and use blue.
Well, that's my theory, anyway. xD [/also took a drawing/art class earlier this year]