Mike-chan

Mike-chan (ミケちゃん) is one of the three cats the Kawamoto family cares for. Mike-chan is the calico cat of the trio.

Although in the story, all three cats are referred to generically in a group (typically as "kitties", or nyaa-tachi), they have been given individual names by Chica Umino outside of the story. For example, Umino shows a picture of Mike-chan and Shiro-chan hoodies in this tweet.