How to build a +def -spd Shigure

I'm no expert, my shigure is also giving me issues, but I with the +Def a raven tome/t adept build will probably work. His main function is sing, of course, but Triangle Adept in the A slot and then a breaker skill (I would pick lance or sword) in the B slot would give him a niche for attacking on you team and let him take hits from red/colorless units even if he gets doubled. If that's too expensive, though, I'd say give him Fury in the A as is right now and just use him for solely dancing. Hope this helps!

Same IVs here; I played around a bit with him to try and make him viable, but ultimately I decided that really the only thing he's any good for is a BLyn check in AA (BlarRaven, TA3, BowBrk), which is a bit of a shame really, but there's not much else salvaging those stats.

Increased Def allows him to tank Lyn more consistently, and the terrible Spd is negligible if the only opponent you're going up against is Lyn (or any other archer). Otherwise, just Sing your teammates to glory - at the end of the day, he's still a Dancer, and thus viable no matter what.