The Armor IIRC has an A.I. that can explain to him it can probably self-destruct.
And damage sufficient to kill the wearer would probably destroy the armor or leave it inoperable.
Let us not forget that it can go into space.
Humm, can't really decide, it will have to be one of:
Peter Parker.
Bruce Wayne.
Steven Rogers.
Deadpool.
Franz Ferdinand Karl Ludwig Joseph Maria.
Simeon I of Bulgaria.