?

? is one of the students of Midnight Horror School. They rarely seen, appearing in the background of only a few episodes. It is unknown what they are during the day.

Appearance
? is void of many characteristics, with their head appearing as transparent square head with no eyes or mouth. Their body is equally transparent and featureless, lacking any sort of stripes to their shirt that the other students have and only their ? being visible.

Official Description
???

Trivia

 * Along with appearing in the ending credits, they can be seen in episodes 28, 32, 39, 52 with episode 32 being their most active appearance.