Ever since you first joined the team, Pyro loved you! So, you were also a pyro. You and Pyro were best friends, burning and setting things on fire with one another. You could understand what Pyro said under his gas mask, but the others didn't.

You came running to Pyro, holding old things for you and Pyro to burn. "Mmph!! Mmphf, Mph!!" He said excitedly, grabbing his flame-thrower.