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Kemonos live off by feeding all of the energies humans give off. 
Kemono can be classified into broader groups than tanuki or kitsune.
- Demon Clans: They are at the top of the food chain and possess high physical capabilities. They are omnivorous, but their appetite includes a different feeling of hunger that requires humans. Known types include Oni, Vampires, and Ghouls.
- Beastman Clans: After the demon clans, they have the second-highest physical capabilities. They possess a form similar to man and beast and are omnivorous.
- Insect Clans: They are omnivorous and peristaltic. Additionally, they possess jointed legs and dwell primarily above ground.
- Marine Clans: Primarily dwelling underwater, they possess scales and shells and are omnivorous.
- Plant Clans: They possess chlorophyll and undergo photosynthesis.
- Spirit Clans: Formless and full of mystery. They are known to not produce.
- Arachne: They are spider Kemono that can create threads for different uses.
- Dullahan: Kemono that are capable of removing their own heads.
- Formless Kemono: Kemono without a physical form, appearing as a mass of dark clouds that can take away the features from their victims.
- Frog Kemono: Giant frog beings that live in rivers.
- Ghoul: Bloodless demons, they are able to regenerate from just a head.
- Kappa: Kemono from Kyushu that love Kappa Wrestling, females tend to be stronger than the males. The Purity Calculus is guarded by them.
- Kanonba: Mosquito Kemono that feed on the blood, organs, and brains of humans.
- Kijimuna: Beings native from Okinawa, they are known to be an easygoing clan of Kemono. They are the holders of the Sky Calculus.
- Kitsune: Fox Kemono that are capable of using illusions and fire.
- Nekomata: They are cat Kemono with forked tails, capable of assuming human form to seduce humans.
- Oni: Horned beings that are capable of growing bigger when angered.
- Serpent: Snake Kemono, only the reincarnation of the Water God is capable of using the Stream Calculus.
- Snow Kemono: Beings that are able to control snow and ice. Females are called Yuki-onna while males are called Yuki-onoko.
- Tanuki: Tanuki Kemono that are able of shapeshifting.
- Tesso: Rat Kemono from the Shiga Prefecture, the previous owner of the Earth Calculus was Raigo of an unspecified generation, who has at least 40 grandchildren.
- Vampire: Powerful Kemono that have eternal youth and immortality.
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