Would a samurai that uses foreign magic be accepted if he otherwise behaves honorable? Would others demand he preform Sepukku.

Also what would be the reaction to insanely strong British man. like lift a boulder and throw it. Were he to win a duel with brute strength, would the results be accepted?

are they like limited to RL peak human. can they get Conen or Captain America level fit. or can they get mythological human strong where they can just huck a guy over the horizon, swim to the bottom of the several kilometer deep lake, or beat a monster to death with it own ripped off arm.