Robin

Robin is a recruitable character that can be found at the Salaryman's building. You just have to win one fight to recruit her, being the easiest gang leader to recruit out of the tree. The other gang leaders are Suzan and Bite.

She offers you a deal to bring her to Winner city, paying you 1000 bucks when you reach there.

Her quirk in battle is being a pacifist (just like Lenny) making calls and gaining money instead, except for her ultimate skills, "PAY2WIN" and "QUAD9", that deal a ton of damage once you get enough money.

The game itself describes her as:

"Likes making calls and signing paper. Doesn't feel like fighting."