Episodes suggesting a friendship
In Yeah, Who? I Wanna Know!, Puffball sings a little song after Gelatin asks who the host will be, singing "Yeah, who? I wanna know!" repeatedly (hence the episode title). Firey is then put in a trance, but then breaks free of it, and answers that that TV should be the host.
Episodes suggesting a conflict
In Get Digging, Puffball gets mad at Firey when he says no one here can fly. Golf Ball tells him to turn around, and after he does so, he sees a giant Puffball. This causes him to freak out and set her on fire.
In The Long-lost Yoyle City, when Team No-Name is close to putting W.O.A.H. Bunch up for elimination, Puffball intentionally causes Firey and the rest of her team to lose, hoping that she would win the prize during Cake at Stake. The first contestant she dropped was Firey, though this could be coincidental.