"On the art side, Jeph enlisted the help of [notable Marvel Comics artists] like Ed McGuinness, Stuart Immonen, Humberto Ramos, and Paolo Rivera. Heck, even I did some character sketches for the show.

The idea being that even though animation style is much simpler than the stuff we generally do in comics, let's get Marvel artists to do some character design work in their respective styles as inspiration and tonal flavor for the animators." -- Joe Quesada