He is a member of Team Stylish.

Trooma is one of Dr. Stylish's stronger henchmen. It is unknown whether he had Dr. Stylish perform experiments on him or not.

In a land where corruption rules and a ruthless Prime Minister has turned the puppet Emperor's armies of soldiers, assassins and secret police against the people, only one force dares to stand against them: Night Raid, an elite team of relentless killers, each equipped with an Imperial Arm - legendary weapons with unique and incredible powers created in the distant past. 
 
Rescued from a fate worse than death by Night Raid, young Tatsumi is offered the chance to join their lethal ranks… but it's a deadly choice, as few can master an Imperial Arm and even fewer survive when two Arms go against each other in combat. The battle is on, and only the strongest will make it out alive.
 
(Source: Sentai Filmworks)

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Pablo Argôllo is a Brazilian actor and voice actor.

Teenage country bumpkin Tatsumi dreams of earning enough money for his impoverished village by working in the Capital--but his short-lived plans go awry when he's robbed by a buxom beauty upon arrival! Penniless, Tatsumi is taken in by the lovely Miss Aria, but just when his Capital dreams seem in reach yet again, Miss Aria's mansion is besieged by Night Raid--a team of ruthless assassins who targets high-ranking members of the upper class! As Tatsumi is quick to learn, appearances can be deceiving in the Capital, and this team of assassins just might be...the good guys?!
 
(Source: Yen Press)
 
Note: Volumes 5 and 8 each contain a bonus chapter.