|Position||Teacher at School-chan|
|Age||40-50 years old|
"Sakura-chan... ur late.."
-Teacher-chan, episode 3
He's not shown much personality besides the fact that he is empathetic when he explains what happened to Terezi-chan. He's similar to Doctor-chan, probably because they're related.
He is a middle-aged human man represented by a stock photo. He has greying brown hair, light skin, and blue eyes with an average build. Teacher-chan also wears a suit and square rounded eyeglasses.
Not much is known about their relationship except that they're cousins. It was probably positive though.
He tells her that she's late, which is probably a common occurrence. He also informs her of Terezi-chan's death and gets emotional, probably knowing how much Terezi meant to her. She also takes his class alongside Terezi-chan, Alloin-kun, and Skutch.
Karkat-kun is his cousin Doctor-chan's son, making him Karkat's second cousin. They both have most likely met but their relationship itself is a mystery.