Making a girl mascot is a double-edged sword; while it would be fitting what with VTubers and all, you run the risk of just having people brainstorm their waifu and adding in all their "preferences" to the idea.
Personally I'd suggest the inmate idea, since it better represents the place itself rather than trying to give it some caretaker or "mommy" or whatever.
Personally I'd suggest the inmate idea, since it better represents the place itself rather than trying to give it some caretaker or "mommy" or whatever.