Build for +hp -spd Shiro?

Fodder.

Steady Breath+QR+Close Defense with Aether.

Bright Naginata
whatever
Ignis
A - Steady Breath or keep Steady Stance
B - Quick Riposte
C - Def Tactic
S - Close Defense 3.

Ignis is absurdly powerful with this, and the countdown of 4 is perfect for steady breath and quick riposte.