I need a reminder though, who is japanese girl mentioning again with "I have to ask her/him(?) about this teleport thing again" or something like that? I forgot the exact words, but I feel like it's not the dragon guy.
Not specified.

It's the person who owned Rudy's house and the puppet. The insignia looked very much like a dragon, but was objectively different to the previous symbol that was shown to represent the Dragon God.