@Elder Lee Hung @Owl Ki @SakazOuki @AkainuTheGrimReaper @Dragon777
Since Oda is blatantly using movie characters played the character models for backstories, I took a deeper look at Akainu's model. So he's obviously modeled after Bunta Sugawara, but his personality and backstory is based off Bunta's character
Shozo Hirono from
Battles without Honor and Humanity.
Hirono was a yakuza who killed a swordsman to uphold his gang's rep and was sent to prison. He made plenty of brotherly oaths via sake cups(one of them Kizaru's character) and all was good. However, the conflict of the show is Hirono seeing his brothers betray and kill each other as time passed. Hirono himself was betrayed and sold out multiple times. It got to the point where Hirono denounced all brotherly ties and went solo on a revenge quest. At the end of the day, the only one he had left was Kizaru's character. Hirono's character was very loyal and headstrong, and hated guys who ran away or turned their backs on the family(sound familiar?).
In MF, Akainu killed a marine for desertion, mocked WB's make believe family, made Squadro betray WB and is very thorough. Sounds like Akainu himself was a criminal in his youth that got betrayed by his brothers, so he joined the Marines(at the same time as Kizaru don't forget) to eliminate scummy criminals to get justice.