Rat is seemingly part of the "Rat Industry", an industry that has many rivals, including mice, which are apparently not related to his kind's business.
As a simple antagonist, Rat is kind of one-note only wanting to rule over all animals. In short, Rat is a single-minded determinist.
Rat is a jet black rodent of the murine rodent family who stands on his hind legs as well as having aggresive looking, whited-out eyes, and he sometimes curls his tail. He is tall enough to reach Usher and You's waists, although he was originally far shorter.
Usher: Rat had infested Usher's bar, Atsushi-Ya, with a toxic plague becuase of Usher's resistance towards Rat's overall plan. Rat presumably hates him or at least doesn't favor him, like most of the other employees. He even joins Usher's personal hate club.
Soul Eater GaidenEdit
Usher is the manager of Atsushi-Ya, a bar for crazy people take a break from their insane lives as he puts it and he talks to the reader brifely about the fact that we're here is that our Soul Wavelengths must be in tune. A jet black rat aptly named 'Rat' comes into his establishment, and Usher proceeds to kick him out the door. Rat swears he spread disease, prompting Usher to become flustered and become a bird. His bar is 'plagued with disease'.
Gaiden 2 Edit
Rat, along with Tonogai and You, forms an Usher hate club. When asked by Usher if he is jealous not to be in his new manga, he replies with 'not really'.
Gaiden 3 Edit
Rat shows up briefly in the third edition of Gaiden, where he is introduced as a biological weapon.
Gaiden 4 Edit
Gaiden 5 Edit
Rat merrily plays a game with the rest of the employees of Atsushi-Ya.
Gaiden 6 Edit
Rat participates in sending Tonogai back to space with a kick. He then attends the latter's grave as You sent the alien back to Earth, killing him.
Gaiden 7 Edit
Rat lets Usher know more about him on the latter's command. He rolls around on the floor shouting 'creature' and crying, only stopping to state that he especially likes zombies.
Gaiden 8 Edit
Rat tries on the helmet crab, Kazukimaru, and introduces himself as a little white mouse who hates black things and horror films, saying that he will protest against the latter. He fights over the crab with Catlabor and Usher.
Gaiden 9 Edit
Rat has an explosive fight with Catlabor.
Gaiden 10 Edit
Usher returns to Atsushi-Ya from a friend's wedding to find Catlabor and Kazukimaru tearful. They reveal that Rat has died.
- Rat is a "black rat", a species of rat that originated from the tropics of Asia.
- A curious detail is that Rat seems to have peach-red eyes in his first colour illustration. However, he was standing in front of You, who has trousers of a similar pigment.
- ↑ This name is first used in the second Gaiden.
- ↑ Soul Eater GAIDEN 3: Volume 3
- ↑ Rat is shown under the list of the bar's employees in the second Gaiden, along with You and Tonogai.
- ↑ Gaiden 1, Yen Press translation. "My ambition is to rule over all of them!!!" (Talking about the rat industry's rivals.)
- ↑ Gaiden 1, Yen Press translation. "The rat industry has a lot of big rivals!! There's mice and all the rest!!"
- ↑ Yen Press translation.