Here's mine. +Def -Spd, but I think I'll switch the IVs to +Spd -Hp for Arena and better tanking. Also need to get to S rank for both supports and replace her C Skill with either Atk Smoke or Atk Tactic. Not sure which yet.
For my Female Robin I have her keen Gronnwolf to be refined as res, draw back, ignis, Mirror Strike 2, Blue Tomebreaker 3 (Might change it to bowbreaker though), and Hone atk 3 and defense +3 for seal
Back in December i didn't know what i was really doing and I haven't really bothered to edit her build ^^
I kept it for tempest trials as well because she avoided doubles easily in battles
Cool, mathematically she becomes a defensive beast! The best part is all the inheritance (except Ardent Sacrifice, and Moonbow, but her native Luna works too) come from *free* units!
I got my +atk cherche up to 36 spd with the speed seal, fury and hammer+ +spd with desperation so she can take down even the toughest red armor units. Shes also a +10 4* unit. Shes a beast! She took down a hardin that was poorly built without taking any damage.