Fuguki Suikasan has the "Fearless: This unit will also have it's Defence and Ninjutsu increased by 1,2% for every time it loses 1% of its Life Points" passive, but I see no change in his abilities no matter how much HP he loses or what dmg he takes.

He doesn't appear to get Tankier like Hinata does and he doesn't get visual increases from taking dmg, so I have no way to tell if his passive is working correctly.