I have been asked about the mysterious other person involved in Shark Dating Simulator's credits, my very pink friend Kemokin. She helped me when I was first designing the game by coming up with some shark/girl suggestion drawings, one of which I adopted and turned into Shark Chan.
I have also threatened Kemo with having to help me brainstorm ideas for the other 3 stories, so she's not off the hook yet.
You can see more of Kemo's doings, including some early Shark Girl doodles at tumblr:
http://forgottenghuleh.tumblr.com/
or Instagram!
https://www.instagram.com/forgottenghuleh