Frost Walrus, known as Frost Kibatodos (フロスト・キバトドス Furosuto Kibatodosu) in Japan, is a large walrus-based (sealion-based in the Japanese version) Reploid and one of the Maverick bosses in Mega Man X4.
Obviously, don't nominate any human characters. Hybrids like Cheetah or The Lizard are okay, as are shapeshifters with one set animal form (eg Professor McGonagall.)
