Arthat is a weasel who tried to help the Bros. catch the animals. He took Tico's job. He wears a blue shirt and a hat. He was soon fired after losing the animals.
Bio in season 3
He has only appeared in Panda Pandemonium. At some point he had found Basil Circus and Cyril Circus and provided some luxury to them. He also meets Tico to whom Arthat calls a pigeon (and in return Tico calls Arthat a rat) and misdirects him away from the bros as he replaced the toucan. When Tico discovered this he felt betrayed and developed a rivalry with the weasel. After arriving to where The Panda Colony was at Arthat proposed using puppets to scare them into a trap: the plan worked, as all the pandas present along with Princess Penelope, Yoyo, Nutsy and Flap wandered right to their trap (a truck), though when Basil found-out that Ling Ling and Blinky Bill (the latter being the primary target) were unaccounted for the human got angry at Arthat, who was clueless on what to do until Flap accidentally revealed they had gone up a mountain with a dragon on it to search for more bamboo. Arthat was then seen being a lookout for Ling Ling and Blinky, but was tricked to leaving his post by Tico. Upon discovering that their truck was being stolen Basil again snaps at Arthat, threatening to fire him should their prisoners escape. They fallow the truck up the very mountain the dragon (actually a statue that acts as a form of security-system for The Mountain Guardians) resides, though Arthat dismisses it as fake, until they came to it, it was here that Basil does fire Arthat and rehires Tico. Despite this he still wants to join them, but Tico had tied a rope from the caravan to the bro's bike and they flew off. Arthat was left behind and was last seen swearing vengeance at Tico.
Personality
Arthat is shown to be sly and sinister, sharing this with Basil, which could be one of the reasons he was given Tico's job. He's also shown to be a bit stubborn, as he wasn't willing to lose his job with the circus bros even when he already had, blaming Tico for it.