-details may change-

I wanted to draw an outfit like that and a character who'd be combatant somehow. I didn't want him to be utilising swords or other too typical weapons, and at first I was drawing him with an umbrella, until I came up with an idea of a needle. The needle can be inserted with different kinds of "vaccines", that can for example sleep, poison or heal the target, or make the target trackable.
Needle 01 is a codename, (or at least temporary name until I come up with a better one) that was given to him for being the first one to try out this still-in-development weapon. The another person seen here is the professor who's in charge of the creation and development of the needle. Utilising this needle doesn't require much power, the user needs to rely on stealth. Needle 01 isn't a superhuman himself, and has even lost all arm wrestling battles against the professor. He does fret over it now and then.

Bio for a character who'll likely end up sitting in my drawer, but yeah.