Optimal Arena Team?

I was thinking of Cherche but you already have Titania and two greens wouldn't be that good.

It's pretty solid if you're going for tactics team, of which Titania becomes the core support unit.

I personally want to run buff and debuff mechanics at the same time. It is so much more cost effective statwise by covering both aspects of buffs and debuffs. So for red, I choose Caeda equipped with chill B skill and double ploys for C skill and seal. R Duel Flying rounds out her kit and perfect for support. Having prf weapon allows her to squeeze out more points. Right now I use Nowi and Fae since they're already built up and they're my source of buffs, running dual rallies and double drive skills for C skill and seal and Fae has G duel infantry. Instead of QR, they can use Renewal or Chill skills because they're not going to be the ones who want to secure kills anyway.

I put a lot of thought into this a few weeks back and started working on my version of a similar focus on feeding the bonus unit kills.

Here's what I came up with and decided to make my next arena core with. I already finished Azura, Soren has 2 merges to go, and Corrin will be next as soon as Soren is completed.

Corrin can provide 7/7/4/4 to the bonus unit which is insane. Soren is just there to debuff and score 750. P!Azura of course, to give your bonus unit an additional turn and a 3/3/3/3 visible stat boost. Corrin + Azura combined can provide a wopping 10/10/7/7 total while a full set of Chill skills debuff your enemies.

I haven't put much thought into the new colorless duel skill yet, but I'm sure you could brew up something similar with a healer involved.