Arro is a character from the anime series featuring Topo Gigio, appearing as one of the primary antagonistic figures. Arro is a cat, part of a gang of feline strays that serve as the main adversaries to the mouse protagonist and his friends. This group is led by a larger, black cat named Megalo, who is described as mean and domineering. Arro’s fellow gang members include Braccio and a cat named Dyna.

Physically, Arro is depicted as plump and has an orange striped coat. His personality is marked by a degree of cleverness and a sycophantic nature. He is described as intelligent and capable of ingratiating himself with his leader, Megalo, often employing flattery to gain favor. This contrasts with his counterpart Braccio, who is more outspoken and critical of their leader. The group of cats is owned by an elderly woman named Signora Knopp.

Information regarding Arro’s specific background, personal motivations beyond serving as a henchman, his development throughout the story, or any unique abilities is not available. His primary role within the narrative is to be a member of the cat gang that creates obstacles for the main characters, acting under the direction of Megalo.