Well KK did go to Signal Academy so anyone from that school would at least have knowledge of her (she was severely bullied, so other students would have: stood by silently and taken note of it, perhaps stood up for her at one point if they were brave enough, or possibly even have been one of the bullies).

I'd be happy to discuss any of these past interactions, if anyone has ideas, and she's also been an outgoing oddball class-clown (unintentionally) at Illuminate Academy.