Steven Magnet is a male sea serpent who first appears in the episode Friendship is Magic, part 2. He was first named in merchandise, and later named in the season five episode Slice of Life, in which he is credited as "Stephen Magnet".
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.)
