Tomoatsu Naoe
Voiced by: Takahide Ishii
A seitai massage practitioner who works at Smiley Boar, a relaxation clinic. He is in charge of setting treatments and meal plans for his clients, who simply refer to him as “Human”. He is deathly afraid of reptiles.

Akiho Ino
Voiced by: Aya Uchida
The 40-year-old manager of Smiley Boar who looks younger than her age suggests. She is unaware that Tomoatsu’s clients are not humans. She likes to regularly go out for drinks, much to Tomoatsu’s chagrin. She also has implied feelings for him.

Elfuda
Voiced by: Ayasa Itō
An otherworldly elf who became fat from eating too many French fries on Earth and is seeking help losing weight in order to use the portal which leads back to her home. Although she accomplishes her goal at first, her weight keeps fluctuating with each visit between worlds due to her fondness for fries. She decides to live with Tomoatsu while following his weight loss regimen. In her universe, she is a skilled archer. Most of the creatures she meets from her world do not get along with her, due to the fact that she is often rude to them.

Kuroeda
Voiced by: Rena Hasegawa
A dark elf who works at a convenience store. She is troubled by her large buttocks caused by long hours of standing and no exercise. Because elves and dark elves are natural enemies in her universe, she does not get along with Elfuda. However, in time, they grow to be frenemies. She is a sorceress that likes to collect materials to brew potions.

Mero
Voiced by: Sora Tokui
A merrow who works at a fish market. She can maintain a human form by drinking a special kind of medicine. She suffers from sagging arms due to a lack of swimming because of her busy work schedule.

Kusahanada
Voiced by: Miyu Kubota
An alraune who owns a flower shop. She has a flower on top of her head and is troubled by its rapid growth from an overexposure to sunny weather. Her hobbies are gardening and sunbathing. She transforms into different personalities when she drinks other liquids than water. She can turn into a man-eating gyaru, an incredibly lean and muscular energetic and coach, or any other person with all kinds of plants: a Venus flytrap by drinking coffee, pitcher plant by drinking alcohol and a shrub by drinking sports drinks. When she drinks Mero’s transformation supplement, she gender-swaps from female to male.

Oga
Voiced by: Ayaka Fukuhara
An ogre who gained a beer belly from excessive drinking on Earth because of a fondness for alcohol. She is a fierce warrior who is tall and muscular, who fights with brute force and superhuman strength. She tends to display strong motherly instincts around children or child-like creatures.

Laika
Voiced by: Madoka Asahina
A lycanthrope who can switch between human form and animal form. She gained weight from the amount of food that humans fed her, thinking she was a pet dog due to her appearance, though she constantly insists she is not. She is innocent and friendly and tends to speak in the third person.

Oku
Voiced by: Aya Uchida
A pig-like orc who used to be overweight, as orcs naturally are in her world. She came to Earth to achieve a slim figure by herself, which she accomplished through a strict diet with swimming exercises. However, when a local gym’s pool was closed for renovations, she became overweight again. She resembles Tomoatsu’s boss, Akiho, without glasses.

Kobo
Voiced by: Kotori Koiwai
A bratty kobold who gained flabby cheeks by eating too many sweets obtained from children at a playground. Although she has the appearance of a child, she is a full-grown adult. She likes shiny things and playing pranks on other people.

Satero
Voiced by: Yuka Iguchi
A satyr who feeds on human desires. She also eats regular food, which has made her fat due to the high quality and excessive eating, particularly of Japanese cuisine. Her hobby is cooking, which she uses to lure her prey. She is the only mythical creature not in Tomoatsu’s group of clients. As such, she acts as the de facto antagonist of the series. On Earth, she will take a human form while out in public, mostly to scheme against Tomoatsu and his clients. However, she becomes easily embarrassed in lewd situations, especially in front of Tomoatsu.

Honeda
Voiced by: Kaori Maeda
A skeleton who was originally a fairy before her death. In her past life, she was a mage who was tried for treason and hung for her crimes. She uses magic to reconstruct her body to what it looked like when she was still alive, although her pseudo-body has become fat as well.

Gonda
Voiced by: Aino Shimada
A lazy dragon who communicates telepathically. Her favorite food is meat and she gained weight by eating too much of it. Her strong instincts have caused her to fail at all attempts to lose weight on her own. Like Kobo, she also has an affinity for shiny things.

Hitome
Voiced by: Mikoi Sasaki
A cyclops who is also tall and muscular. She has been boxing to lose weight, but due to her huge body, she has not been able to find a suitable sparring partner. She is bigger and taller than she normally appears and reverts to her original size if something, like a thunderstorm, scares her enough. She becomes sparring rivals with Oga due to their similar heights and builds, then maternal rivals when Kobo is involved.

Oeda
Voiced by: Shizuka Ishigami
Elfuda’s aunt. She is a weapons tutor who is known as one of the best warriors in her family. Her body is covered in scars from past battles. She came to Earth to bring Elfuda home, but also became fat and unable to return to her universe due to an addiction to soft-serve ice cream.