Ideas For A +Spd -Res Legendary Ryoma?

Slaying Edge+ (+def)
Brazen Def/Res 3
Bushido / Renewal 3
Threaten Atk / Atk Smoke / Flexible
Close Def 3

This is more of a defensive build. With Slaying Edge's defense refine, Brazen Def/Res, Fortify Fliers buff, and Close Defense seal, Ryoma hits 51 defense and 30 resistance on enemy phase.

Could also keep his Raijinto. I went with Slaying Edge in the picture for the added defense. I picked Renewal since he'd appreciate the added healing since he'll be tanking a lot of hits, but it's not necessary. Could go with Bushido.

Just an interesting build for him aside from the normal Player Phase Hyper Offensive build.

This could be fun...

Wo Dao+(atk)
Reposition
Glimmer/Moonbow

Death Blow 3
Bushido
-flexible-
Quickened pulse

This build is more for fun than strategic use, as after the first kill, he's rendered quite vulnerable, but if you want him to stomp multiple enemies, consider slaying edge, distant counter, or flier guidance/wings of mercy, he'll end up a little less strong, but his chances of surviving will increase a bit.

Cheers!