I'm really curious about this world's Sophia and Nicol, plus there's there's "Sirius". Nicol was Jeord/Gerald/whatever's friend before the prince met either Katarina variant, so if the prince is suddenly curious about the new, weird, Katarina, then that might get her on Nicol's radar, and being in the student council Sirius will be watching the prince change too.
Honestly, Keith might be the hardest one to deal with, a whole life of abuse and stuff in this timeline.
Oh yeah, where's Alan in all this? He's always the forgotten tag along anyway, so he'd be safe with not raging lesbo Mary in this timeline, right? Especially if Maria ends up more curious about Katarina and doesn't go down the game routes with all the guys much if at all.