The cat has yellow eyes and grey fur with white legs, tail, chest, belly, and some white on their face. They have a frown and grumpy eyes. They look less grumpy when they're meowing.
Grumpy is cautious, rude, and unfriendly to newcomers. Once they get to know someone, they will act friendlier. He's shown to apologize for being rude in random battles where he is the lead cat.
To be added.