Gumo

Gumo is a member of the Sakura Shinobi Squad, a group of 6 ninja siblings that patrol the distant island of Sakura at night and keep the walking paths safe.
Gumo is the most notable member and self-proclaimed leader of the Squad, keeping the more rebellious members from overstepping boundaries.
He mostly patrols Sakura's urban area, fighting off dangers like overconfident yakuza and the occasional yokai threat.

Personality: 

Gumo is the typical edgy type - always keeping to himself believing it's the best way to conceal his ninja identity. His brooding mannerisms do end up attracting lovestruck students at the school he attends, but he's very good at deflecting compliments. Sometimes he shows off, but it's usually to inspire an impressionable mind.
Gumo's ashamed to admit he doesn't do well in social situations simply because he chose to not learn social skills, so he often stays quiet when conversation starts in his friend group, hoping conversation dies down without him getting involved. He also gets easily worked up when being excessively questioned.

When it comes to his vigilante life, he's very quick to act, wanting threats or dire situations to be dealt with swiftly, but it often causes him to make hasty actions without foresight.
His other squad members often scold him for his lone wolf ways as well. Gumo's lack of trust in others besides his own squad comes from believing stories of yokai trickery, and hearing about others spreading dark secrets around.

Abilities/Weaponry/Attributes:

Athleticism: Unsuprisingly, Gumo is very athletic. He studies parkour now and then to better navigate rooftops and building walls. He's also hard to keep up with in a sprint.

Mini-Katana: A one hand katana that Gumo regularly uses. He got it from a mysterious shop. He vowed to never lose it as it's his only way to reasonably combat yokai threats.

Stealth Suit: An almost skintight suit designed by one of his sister figures. The mask that's a part of it actually goes well in blocking out poisonous gases (which really helps his fear of a certain species of yokai)