The collector Rabbid only appears in Rabbids Go Home. He is a large Rabbid playing a Helicon that will act as some sort of checkpoint in which the player can give all the stuff he's collected throughout the level to him in case you fall off a cliff or die. The collector Rabbid has his own theme song that he will play whenever you give him all your stuff, the song can also be heard on the Wii menu before starting the game.
When not found during the levels of the game, he is usually found playing music along with the Rabbid Brass Band. His name is Henry.