Syan and Guest are a married couple of yokai from the race known as Nāga.

Nāgas are giant serpent yokai that are either half-human, half-snake (upper body human, lower body snake) or entirely serpentine. Syan and Guest are both in their half-human, half-snake forms.

Additionally, Nāgas in their full serpent form possess a single horn in the center of their head.

Characteristics of the Nāga Yokai

Low body temperature — They dislike cold places and prefer warmth.

Habit of coiling — They unconsciously curl their bodies into coils, especially when relaxed.

Vertical pupils — Their pupils narrow as their emotions intensify.

Scent detection via tongue — They can sense smells in the air with their tongues.

Molting — They shed their skin periodically; the skin is exceptionally sensitive immediately after shedding.

Snake-like reflexes.

Strong tail power — Used for gripping objects or pulling opponents.

Venomous fangs — Usually hidden, revealed only when necessary.

Types of venom — Paralysis, Hallucination, Sleep.

Exceptional night vision. They enjoy lounging lazily under the sunlight.

They nap near warm stones or heaters. Activity levels drop significantly when cold.

They prefer rainy days or humid environments. They primarily nest in caves.

Once they choose a mate, they follow only that person for life. Once they memorize a mate's scent, they recognize it so strongly they cannot confuse it with others.

Nāga yokai recover quickly even when cut by blades and have the ability to spit venom. They are nocturnal, sleeping during the day and active at night. Their diet is carnivorous. They eat by swallowing prey whole without chewing.

Syan and Guest are bonded partners who have imprinted on each other by plucking a scale from each other's lower bodies and swallowing them.