She's said that she doesn't want to collab with anyone as Kero except when she asked Mint Castella that one time, but they were both pretty drunk so probably don't really count that. So a live partner is pretty far off the table.
As for relationships, she keeps that pretty private and doesn't really talk about it, and speculation would lead to the kind of schizo theorycrafting that would drive this thread insane, so kindly don't.