You hear distant shuffling, footsteps, and then voices before a young guard comes to your cell door, keys in hand. You quickly sit up in bed, looking down at the cell door from the top bunk.

"You've got a new cellmate." the guard says blandly. Someone quietly shuffles into your cell, being pushed in by the guard. As soon as they enter, the cell door immediately slams shut and the guard leaves down the hall. The teen simply stands there, looking up at the bunk above them.*

[who is it? (if you want another starter, put it in brackets and asterisks. if you don't care which character is your new cellmate, say 'surprise me')]