Diego brando

Diego possesses a strong misanthropy, describing humanity as a 'flock of pigeons', and resents humans as a whole for the death of his mother. Therefore, Diego is naturally solitary, never seeking to join with anyone, and in the event that he has to cooperate with someone, he will maintain a certain separation between them. Diego sees human life as useless and will sacrifice anyone to further his unscrupulous goals.

Diego sees Johnny as his rival and although these two are not brothers like their original counterparts they have both influenced each other's lives quite a bit. Diego and Johnny have competed in several jockey races, with Diego constantly crushing Johnny in every race they have both participated in doing everything possible to humiliate him, despite this both Diego and Johnny have a genuine respect for each other because of their horsemanship skills and their great mastery in their rides. In the Steel Ball Run they both repeatedly clashed to get the Sacred Corpse's parts.

He is also quite treacherous. For despite allying himself with the President, he eventually breaks his alliance with him and goes on to team up with Hot Pants in a plan to steal the parts he still held in his possession from Valentine. This shows that to achieve his goal he has no qualms about allying with different people and then betraying them when they are no longer useful to him, which makes Diego someone quite selfish and Machiavellian in the pursuit of his personal goal.