I am tempted to feed Celica to my GRobin.

Woah fully built and perfect IV Celica? Nah not worth I sacked mine because her IV was terrible but for you there's got to be other options for you to explore.

I miss the days when we didn't need to worry about optimal A skills

Well, I sacked mine out of spite because she was a 4.5% pitybreaker when there weren't any green orbs. She literally had the worst IVs possible though (imo, +def -att), which was the main reason I did it. It only depends on how much you use her really.

Although Grima would love to devour Celica(And probably every other human) I don't think the summoner in this case would like it.

I hardly use my Celica.. Ever. Same with my Micaiah. If V!Ike didn't win the voting event, I'd probably sack Micaiah for her A skill to my Grima (whenever I.... actually get one.. *sniff*) because I just like him so much.

Keep Celica. Fury can work just fine on him until you can get a better skill. Or if you have Close Defense fodder *cough* Joshua *cough* that’s also an option.

Alternatively, if you get/have a bad IV Hardin or currently have a bad IV Winter Chrom your willing to fodder, Grima does excellently with Brazen skills.

If you want a "cheap" A skill for grima, fortress def gives a great boost to his def, and the lost of 3 attack is not notable due his massive base attack. Also is a skill found in 4* seths. Fortress Res can be good too but is a rarer skill.

I gave my +atk grima fortress def and im happy. Now he have 57 atk and 40 def, plus DD/CD seal, he becomes a great wall.

Not really sure why you would do this since Celica is the better unit