Box & his dad

"MY DAD WILL STOMP YOU." -Box threatening the unthreatenable Bonkers.

'I STOMP ON MAN FOR FUN." -His dad going mentally insane.

Box is a Boxling, while his dad is a freaking Phytotitan. They have a strong hate for Bonkers for some reason... The dad might be brothers with the Tree Giant, but much more insane than his brother. The whole "little guy with his titan dad" situation happened before with The Sting Boys theory.