User blog comment:PaulLevesque555/Yi Sun-Sin/@comment-25848535-20190716004742/@comment-25848535-20190716050044

Although I my bottomline for GB is rather low, I myself hasn’t done any GB servants yet, Uesugi was vastly suspected to be a waifu ...

Without Invincibility it means he’s almost wide open to concentrated attacks: his 3rd skill completely nullifies his NP def up plus taking 2k damage, that’s rough even with a Guts.

You could give him a waterside passive such as Naval Warfare Perception: grants him 1 time evasion each turn on waterside field. This could occasionally save him, but restricted to the place where he’s most efficient for, so not making him too OP.

Just my opinion, (whisper: you should make them more OP, like OOOOOOOOOP!)