Or maybe she's Kumoko with her memories back? Kumoko is the only student with "No name" so far instead of two, and we know D likes to personally mess with her for funzies.

Other question, did Sophia "mercifully" tell them to take Yuri (the priestess) away out of concern for an injured reincarnation being hit by a stray attack, or did she casually ask for them to remove Yuri because she's the priestess and Sophia is a vampire progenitor and played it off like it wasn't a huge deal?

Like the Hero and Demon Lord are keyed to each other and Shun is the only one capable of more easily killing Ariel, are Sophia and Yuri opposed in role?