Numbuh Ten to Midnight wears a long grey cloak covering his face and whole body. He tends to walk monk-like and shows red glowing eyes with the hood over his face. When he draws the hood back, he is shown to be green-eyed, red-haired and freckled. He has braces on his large front teeth and dark circles under his eyes.
He met with Numbuh 5 and Numbuh 2 once he arrived at Sector V, who briefed him on the event that resulted in the need of an exorcism. Numbuh 2 was sceptical of Numbuh Ten to Midnight's abilities. Numbuh 1 had suffered a papercut while fetching the newspaper for his father and an infection had turned him into an adult.
Numbuh Ten to Midnight performed the exorcism by splashing chocolate syrup on Nigel's suit, breaking his glasses and showing him a Rainbow Monkey while singing The Rainbow Monkey Song. However, this did not succeed and Nigel had turned into a devil-like adult instead and attacked Numbuh Ten to Midnight. Numbuh 3 walked in on them and revealed that Nigel had just used her make-up, making fun of Numbuh Ten to Midnight the whole time with Numbuh 2 and 5 watching. When they weren't looking, Numbuh Ten to Midnight had make-up applied to himself and scared the other operatives in return.