Fifteen

From Witcher Wiki

'"-A half-naked athlete, sweaty, girded crosswise with belts, and wearing spiked pads on his forearms." -The Last Wish

Fifteen used to be one of Abergard's subjects in the Free Angren Company, and it's from those days he has his nickname.
He joined Renfri's band, probably at the same time as Nohorn.

Played by Bogdan Michalak in The Hexer.