Malcolm Mordio

Mistaken Identity –
Malcolm bears a striking resemblance to his twin sister, Mika. As such, he is often mistaken for her by bounty hunters, pirates, etc.

Ambitious –
When the Marines arrived in Skypiea, Malcolm saw it as an opportunity, and the prospect of authority and renown was appealing.

Domineering –
While he's fine with ignoring minor details of a situation and is willing to take others' input, Malcolm feels uncomfortable when he does not dictate the overall trajectory of a situation. As such, he tends to take command and gravitate towards leadership roles.

Backstory:
Growing up, Malcolm Mordio always had a tense relationship with his fraternal twin sister, Mika, both due to her intellectual superiority and her lack of ethics. Ultimately, they had a falling out, and she left Skypiea to pursue her studies and the two cut off all contact with eachother. When the Marines arrived in Skypiea, Malcolm saw it as an opportunity to do good for the world, and the prospect of authority and renown proved appealing.

Despite his racial background, he managed to gain acceptance among the Marines. However, his reputation among his comrades was severely damaged when the Son Pirates, along with his sister, were catapulted to infamy with their raid on Silver Forest. As a result, Malcolm has vowed that he would personally hunt down Mika and bring her to justice himself.