Although Xeroioa does not have the same magical gift as her sister Mystical, she also shares with her the peculiarities of upbringing in their unusual family. She is distrustful and hard to get along with others, but, having become attached, cares as much as she can and understands. If she loves you, you are safe, she will do everything for that. It's in your best interest that she doesn't see you as a threat to herself and her loved ones.
Francoeur appeared to her as accidentally as Kenji did to Mystical - she made a mistake in some spell and summoned a ghost fox and dragged him to Xeroioa, deciding that it was very funny