Pero

Pero (ペロ) is a minor character in the Toaru Kagaku no Railgun manga series; a stray dog that Miyama Shaei considers to be his only friend.

Appearance
Pero appears as a dog with a robust frame and a light-colored coat. Its appearance closely resembles a dog from the Shiba Inu breed.

Personality
Like most dogs, Pero is friendly to those who treats him properly. He is often seen wandering around a park in Academy City, and is noted for eating even things that are "questionable".

Dream Ranker Arc
Pero is introduced as Miyama Shaei's companion whenever the boy feels ostracized by his classmates. Eventually, Shaei and Pero become familiar with each other, with Pero forming a sort of bond with him while Shaei turns him into a confidante of sorts regarding his personal problems. This continued even as Shaei transferred schools.

Eventually, Pero shows up in Shaei's predictions, where the dog is surrounded by fire. In his desperation to save what he considers his only friend, Shaei asks help from Shirai Kuroko, who has shown to have the ability to overturn his predictions. At the appointed day of the incident involving Pero, the dog is saved by Kuroko.

Shaei soon decides to give Pero to a new owner after he makes a full recovery. As agreed upon, Shaei entrusts Pero to his former classmate Ookawachi Megumi.