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Floch joined the survey corps with delusions of grandeur but quickly came to find out the horror that awaited him. After hearing Erwin's speech he accepted his fate as the fodder foot soldier he was but after he miraculously survived Zeke's onslaught he saw it as his duty to then
Save Erwin. Floch pleaded that if humanity were to be saved they needed a "devil" like Erwin Smith but upon seeing Erwin at peace Levi decided to give Armin the serum, this event would later shape Floch into the person he became. Post-shiganshina we see Floch act insensitive
Towards his peers, he blames them for making a rash, emotional decision. Floch has adopted an attitude where he can't let his emotions get in the way of the greater good and because he experienced his superiors and peers making a "bad" decision based on their emotions he became
Post-timeskip Floch had become the leader of the Yeagerists and leads his troops as the twisted version of Erwin Smith he has in his mind. He indoctrinated new recruits by having them beat up Shadis and in his mind he is like Erwin becoming a devil for the greater good
But where he and Erwin differ is Floch still feels that he is more important than he actually is, as shown in 129 where he says he will be the one to save Eldia while Erwin never saw himself as a saviour
