Cell Roron

Cell Roron, one of the minions of the Noah Family, is the "Prisoner of the List Cage", keeper of the list of people the Millennium Earl wants killed.

Appearance
He is dressed like a jester with a hat in the tip a ball.

Suman Dark's Fallen Arc
In the climax of the Suman Dark's Fallen Arc when Tyki Mikk pull out the card Cell Roron to see which one is he going to delete and Cell Roron said Allen Walker is one of people listed in the card to be deleted.