Did someone mention my name? I can't believe you started a thread and didn't invite me....
Seriously thought, mutant animal characters are numerous.
Various - Ratmen, Redwall inspired forest creatures
Interloper - Chickens, Termites
Reaper - many different
Impact! - all kinds Elephants, Platypuses, etc.
Alchemist Miniatures - Catmen
Ainsty - APes
Eureka - apes, monkeys, cats iirc & Moorcockian Beast-masked humans.
Black Orc 100 Kingdoms - Apes
Crocodile Games - Crocs, cats, Hippo iirc
Alternative Armies Flintloque - Austrian Dog humanoids
Perhaps we could start a list of Humanoid/Mutant Animal and Plant miniatures?
Doug Wildey was the main character designer for Thundarr. King Kirby did backgrounds and other incidental stuff no doubt. Many of the villains have a Kirby-esque look to them.
Two volumes of Kirby's Kamandi are in print:
http://www.amazon.ca/Kamandi-Last-Earth-Omnibus-Vol/dp/1401232337Encouragingly Kamandi has resurfaced a couple times in the last decade after being written off in 1986's Crisis of Infinite Earths. His new home revealed in Grant Morrison's Multiversity is a mash-up of Earth AD and the New Gods - double Kirby goodness!