The Beast

Real Name:  Hank McCoy

The Beast is a member of the X-Men, possessed of great strength and agility.   He is a genius polymath scientist, which belies his appearance as an animalistic, blue-furred simian-like creature. 

The Beast has not appeared in any episodes of the Avengers: Earth's Mightiest Heroes, but was confirmed as existing in the continuity by an appearance on Nick Fury's bulletin board of people suspected of being Skrull replacements.