A Skill for PA!Shigure?

Does he even need that speed refine? He's already so slow, that he won't even double Zelgius or BK, probably not even A.Tiki, so investing in his speed would require much more than just a speed refine.

I don't know, how well breath of life works on him, because I can't imagine a situation where it would be worth it for him to attack somebody instead of giving his turn away by dancing. Anyway, if you want to go with your intended speed refine route, you might as well go for more speed, so that you can actually secure some follow-up with him. In that case darting blow would be the least expensive option.

But honestly, his defensive stats are pretty low and that combined with his speed makes for a poor combination (unless you heavily invest in his speed), becacuse he can't really duel anybody and has to resort to fighting people that can't retaliate. Giving him TA because of that would at least capitalize on his relatively good attack stat and would allow him to actually deal some damage to reds and even be able to tank them at the same time, even though his speed is abysmal. Choosing a different refine in this case would be preferable.

Tbh, I wouldn't invest into his Spd unless his Iv is +Spd. His Spd is a bit low to be salvaged as his Spd is 26, the other possibility is to turn him into a Mage Tank, but his Res also is considered low. PA units should be only 'support' units as they don't possess any offensive abilities (Except PA!Olivia in some scenarios) I would refine Res and give him fury or give him SB. You can take some ideas from my PA!Shigure if you'd like.

Wow you guys with your +atk Shigures. I have a +res-atk iv and I've been using Darting Blow 3 to at least avoid some doubles or double slower units. He still works fine since he's dancing most of the time. For your A slot, I'd go with Death Blow 3 and a Atk refine on his tome like everyone else said

Yeah I don't like his spd especially with a bane and I wouldn't refine for spd. +atk (IV), however, I like for potential to OHKO some low-res reds using TA. I don't like BoL so I don't like the triple BoL build, but if it's working for you I have nothing to say against it.

If you're not giving him a 5* tome, I'd probably keep the dancer's score just to save feathers, but if you will I would take either a raven or a blade tome. With +atk P.Shigure I would probably go TA and look for OHKOs. The main issue with what I'm suggesting is that your team already covers everything that he could - Virion is fine against bows and daggers; Arden is probably fine against low-res reds...except some tomes? (Ex: Tharja has relatively poor res for a mage) Maybe wrathful staves could cause your team some issues? I guess you could give him raven + R tomebreaker if you wanted to really shut down all of that? You'll probably have to take the staves in two rounds either way.