Litterbot

Trashbots are robots seen in Yu-Gi-Oh ZEXAL.

As the name suggests, they are designed to collect trash around Heartland. Each Trashbot has a number written on its sides. They are often used as comic relief, like trying to take Yuma's deck and later "eating" Yuma himself.

In episode 13 it is revealed that Haruto Tenjo has the power to send the trash they collect to the Astral world under the orders of Mr. Heartland who appears to work with Dr. Faker. The trash damages the Astral world, but Dr. Faker is shown to in fact want this to happen probably as part of whatever he is planning.