Aahhh I'm glad to hear it strikes your fancy! AU Minato has FeMC as his older twin sis but he's older than her as OU... duality of sister. When he starts getting original memories back we can have the usual "we occupied the sameish place in existence??" nonsense! Two characters can be apped a cycle with a present cap of three total, but with the short time maybe you'd like to stick with one for now~