In my old arena team, I ran Robin as a half-healer. However, I recently built a support-oriented Marth, who also runs RA. He also has the same HP as Robin. Should I replace her support slot and B slot? If so, with what?
I was leaning towards Guard because she ends up surprisingly tanky with supports, Deft Harpoon and Drive Marth. My main gripe with it was it's 5-star status. Desperation and Vantage also seem like good skills, but I like to play Robin with 100% HP.
For support slot, should I go with a dual rally, Harsh Command, or a positioning skill?
Edit: Robin's neutral in case that changes anything
For the tank route you're going, renewal will help to keep you're survivability. However, I do find the res refine not really necessary. With marth support and DD3, you can tank mages pretty well, and theres no real reason to even tank them in the first place without distant counter. To give her a more offensive role, spd refine and desperation/vantage works well (whichever you prefer)
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