Rate my Flier Emblem

If hone fliers wasn't such a 5* locked skill, I would recommend at least one of them to carry it, ideally a tank or slow unit who doesn't particularly need the spd like your Summer Y!Tiki. I still think reposition is the superior movement assist skill for all fliers because their unrestricted terrain movement can cover great distances with it and allows you to reset positions or recover with renewal. I have won many games with flier emblem just stalling a bit until I have enough HP again.

Interesting build on Myrrh. I personally have DC+QR, which is particularly useful to save myself a turn dealing with archers since she carries Iote Shield seal anyway.

Shigure has enough HP to use LnD well so he could take 1 hit and be in desperation range. Though I prefer Luna over Moonbow, especially when you chose to run Brave Bow on Hinoka WF instead of her armor slaying bow.

Hinoka WF could switch out her Flier Formation and Flier Guidance. I find that flier emblem is an archetype that has an aggressive playstyle and I usually default to 1 hone carrier and 3 goad carriers. With Flier Formation seal and repositions, I find that these provide enough mobility for my flier emblem needs. Then she can free up a B slot for your considered Chill Def or something.

Caeda could substitute into Hinoka WF or Summer Y!Tiki. Her forte is dealing with armors and cavs but she's also a great magic soak if you need to take a magic hit. Cherche could sub into Myrrh if you need a more offense oriented team. Spring Kagero can sub into Hinoka WF, mainly as a support role. She can pick off squishy units to try and OHKO while debuffing surrounding enemies for the others to clean up.