Aki is a man of stoic and detached demeanor but it's more of a facade to hide how much he really cares for the people around him. He's terrified of becoming close with people in fear of losing them on the job or even scared that he might die soon and leave them behind. He's a man prone to self sacrifice, thinking that it's better for him to get hurt instead of others. One thing he fears the most is to see his friends die in front of him. Deep down, Aki is a very caring and protective man.