Red has the outlook of a vicious animal but the intelligence of a genius. He joins you when you free him from Shinra's 'mad professor' who was running experiments on him.
Red is another character that people tend to underestimate, but I've found him to be extremely useful. He has good attacking power and is also good with magic, he's just not particularly fast. His best weapon is the Limited Moon while his best limit break is Cosmo Memory..