Sushimada

If using in dragon team I vote for a TA core of Nowi, Fae, and Tiki (A as the budget option). Ena…

Innes would probably be my choice to proc resistance-based specials, but brave bow/firesweep are…

You could always just have multiple Reinhardts for arena cheese.

I would say desperation only in a flier emblem setting because otherwise his speed isn't really c…

I have the same exact Corrin here with the same fury desperation build except I kept dragon fang…

+ATK -SPD, I would save the other for heavy blade

Xander or Eirika is my vote

That's the second best IV so keep him. If you find a +SPD one later you can always merge.

Renewal for longevity (eg Tempest), breaker for short fights like arena

He's a turtle anyways so +SPD really isn't going to help him much. I would wait, but if you need…