Litterbot

Obots are robots in the Yu-Gi-Oh! ZEXAL anime.

They are designed to detect and collect trash around Heartland, when they find trash, they yell "Garbage!" or "Trash!", then they grab and "eat" it while yelling "Cleaning!". Each Obot has a number written on its sides. They are often used as comic relief, like trying to take Yuma's Deck and calling it trash in ways each time more offensive and later "eating" Yuma himself.

Haruto Tenjo has the power to send the trash they collect to the Astral World under the orders of Mr. Heartland and Dr. Faker. The trash damages the Astral World.

Ukyo Kitano and the criminal from episode 013 attacked obots while possessed by the Numbers, though it was not their main goal, the Numbers apparently told them to do it. This hints that the Numbers know that the real use of obots is to destroy the Astral World, the dimension they come from.