So Misaki and Ilya's first encounter went... about as could be expected.

Ilya's a bit unhinged, but she can be nice enough if treated well, and she's got a ghost pokemon (Duskull) who she thinks is absolutely adorable, so after the wounds have healed from their first run in she might be a good candidate for getting Misaki used to them.

She's also familiar with the "I love my sibling so much I'm going to kill them" feeling (she hasn't actually done it, but she's responsible for like... a quarter of the bad ends in her game) so she might relate to Mayu. Whether that's a good thing or not is debatable, natch.