LogFAQs > #968969646

Neither of the Christmas cakes are particularly meta defining. X!Christina is good for about 1 CB, and after that her biggest draw is more stats for regular Christina. X!Ilya is a ST magic attacker, but she still self-damages (though I think it can't crit her this time), she's a permanent unit, and she'll be overshadowed very quickly by NY!Karyl. Should have free daily pulls on X!Ilya and NY!Karyl Prifest banners though (assuming we keep following JP schedule).

X!Nozomi is bad. I'll probably push the event for her shards anyways because it's Nozomi, but she's bad.

Out of the new UEs, only X!Ayane is particularly good for CB, but overall it just makes her into a good physical attacker, not an overwhelming one. X!Kurumi is mostly a very niche PVP unit, though if you plan to use her she kind of needs her UE for her first skill to be very useful. X!Chika is useful for looping, but that requires a lot of research and planning for manual CB play, and you don't want to equip her UE if you plan to use her for CB loops.

6!Io is good in PVP (a really good disruptor, probably meta-defining for some time actually). Not a big deal otherwise.