ShiKage's Ultimate Hayato Guide

Hayato has an 85% chance to not take damage at all. With that HP, that dodge rate, and the ability to heal yourself, you shouldn't be having any issues at all.

However, make sure you have Kaiser's link skill, full character card decks (if you have S rank decks, that's 1,400 HP), and any HP-giving gear you can find. Maybe try getting some %HP potential on your gear.

HP washing isn't a bad idea, though. If you can do that, your survivability for every situation would go up immensely.

Ah ty Link for the information
I never created a Kaiser and not many S rank cards

I guess I'll look into HP washing methods I've never done it before