In case it wasn’t obvious from the facial similarities, Cal is Art’s identical twin brother. Yes, identical. Don’t let that hairstyle fool you!
He shares a room with Art and likes most of the same things, with other interests including music composition and writing stories. You can find his work here (the musical stuff, anyway).
Cal was going to make a webcomic about his life in high school, but his brother beat him to it. And then his other brother. So sad.
Before you ask, his hair is not available for purchase. Or his hair gel.
First Appearance: 5. White
Technically, I made Skeptical Cal before the above comic, so I guess that counts too.