Assisticat, known as Sub Manager in the Japanese version, is Misaki Tokura and Shinemon Nitta's pet cat that does some certain tasks in Card Capital, like watching over the counter while Misaki is away.
He occasionally stays on the counter next to Misaki and is sometimes naughty but spends most of his time asleep. It is shown that he is resentful of being called "Sub Manager" and prefers "Manager", which shows he will only do tasks when called this. He also seems to understand the Human language and their expressions, as he responds when being spoken to in general.
He appears to be a tuxedo cat, with white paws, belly, tail tip, and forehead spots, and a grey top coat. He has blue eyes, and wears a blue collar with a gold tag.