I wonder if I should use it to get the last dupe for Nadeshiko (teen Dianthus) as that would unlock her last item slot, and with trinkets, she is pretty darn good already. Add one more to that ... yeeah.
Or maybe get some one new. Hmm would have to take a proper look at the 5* list, though regardless of who it would be, the girl would sit on the bench most likely. At this point only 5* Dupes have any real value to me as they open slots for items thus improving my WS power ever so slightly.