The main character in monsters! Here's a little more info on him:

Inko is a very cheerful monster! He’s still very new and doesn’t know much, but he’s doing the best he can! He currently works as a deliverer but would love to become a monster hunter someday. Since he’s still a very new imaginary friend, he visits his creator often. She’s pretty shy, so Inko does his best to help her break out of her shell and make some new friends. When he isn’t with his creator, or working at his job, he really enjoys finger painting! His favorite thing to paint with is ink of course. Sometimes he drinks the ink.