I seem to finally have a Flier team for arena due to not getting Ryoma from the Hero Fest, that banner really sucks because two a percent increase didn't make much of a difference for me, I got upto 6.25% for Focus before I ended up with a 5* that wasn't focus.
Although I'm not sure if it will be that good. I ended up with a lot of 4* Caeda units thanks to trying to get Ryoma and failing.
It will be difficult trying to get more Hinoka and Minerva units since they are only 5* and I didn't try getting more Hinoka units back at the voting banner.
I haven't figured out what's the best skills to give, I guess having Goad Fliers on Hinoka and Caeda is better than having Hone/Fortify Fliers while Minerva still has Ward Fliers if necessary, otherwise, Goad Fliers on her too.
I want to give Caeda Ruby Sword+ but Armourslayer+ has been pretty useful, still thinking about it. She doesn't do great damage and has low health, maybe I'll give her Seal Attack to at least not let enemies beat her easily. I don't know if I should replace her Darting Blow with Fury. (Which I would probably give her Desperation or Renewal then.)
Hinoka's​ Blazing Wind is a very good AoE move, but if it doesn't work well in arena, I could try something that triggers quicker like Moonbow or Luna. Especially if I go with Goad Fliers because Blazing Wind doesn't benefit from combat buffs.
And then the other part is thinking about their mobility, I lack a ranged attacker so I need good support skills or whether I should use Wings of Mercy/Escape Route.
Reposition is really good on fliers, don't have to worry about terrain.