Tonari no Kaibutsu-kun (となりの怪物くん, lit. The Monster Seated Next to Me) is a Japanese manga written and illustrated by Robico and published by Kondasha. It is about the relationship between a girl named Shizuku and a boy named Haru. An anime adaptation of the story by Brain's Base began airing on October 2, 2012. It is also being simulcast on Crunchyroll under the name of My Little Monster.
Below are the characters found available on the site that cosplayers have depicted.