Alhaitham

Tighnari is an hybrid creature, he had fennec fox ears and tail and his sense of smell, hearing and vision were also better than common humans, though hybrid humans weren't as oppressed as vampires were since they were like normal humans and get their nutrients by a normal human diet, he is a scientific that works in the health department in the same guild as Alhaitham, he specializes in studying every kind of creature and living organisms, they and Kaveh also meet in high school and also knes about Kaveh being a vampire, also helping him to keep his secret. Tighnari was Cyno's closest friends alongside his apprentice, Collei, a girl that helped Tighnari with his work to learn from him, Cyno and Tighnari treated Collei as their younger sister. Collei, Tighnari and Cyno were all close friends of Alhaitham and Kaveh, being witness of their complicated relationship

Cyno is a famous judge of Sumeru that makes sure people and vampires aren't treated and punished unfairly, though he has ended with several vampires himself, Kaveh doesn't consider him a threat and even trusted his secret to him, obviously with the condition of not telling anything to Alhaitham, Alhaitham also trust Cyno so Cyno is a good friend of both of them

Elemental visions are magical amulets given to those who have a really strong desire or ambition, depending of what is that desire or ambition about, the element of the vision will be different, no one knows exactly what are the requirements to get a vision of one specific element, but whoever gets a vision of one of the seven elements (Pyro, Hydro, Electro, Cryo Anemo, Geo and Dendro) gets special abilities of that said element, Kaveh and Alhaitham have both a dendro vision, even though their visions are of the same element, their abilities aren't and can't be the sameb since that depends on the person who owns the vision.

Hunters are ranked based on their abilities and efficiency in their job, Alhaitham is one of the few hunters with a the highest rank, the S-rank, beneath that level there's is A-rank, B-Rank and E-rank. The organization specializes in investigating vampires attacks but also in another beats attacks, they're the biggest hunting guild of Sumeru, which is why Kaveh can't let his guard down when Alhaitham is around.

Vampires are forced by the Sumeru government to hide themselves and blend in with the society unless they want to get killed, vampire's skin are more sensitive to the sun, but that can be fixed with regularly using sunscreen, they also can eat normal human food, but need to drink blood every two months, otherwise they will start craving it, lose their sense of taste and their health might collapse, that's why the government sends them surgical blood bags periodically, though the blood tastes like medicine since is treated with preservatives and artificial nutrients, is not really a good taste and vampires are treated really unfairly, which is the reason many vampires refuse to live like that and start doing awful things.

Vampires naturally have a special charm to lure humans into liking them, that way they can lure humans as their prey, sometimes their charm is beauty, or abilities from the entertainment industry, which is why many idols, models and actresses are secretly vampires. Kaveh's charm is definitely his talent as an architect, though it was just how his nature was, he never used his charm to manipulate anyone.

Vampires have normal eye colour and normal teeth, which is the reason they're not easy to identify, but when they smell blood, their eyes becomes a brighter colour and his vampire fangs come out, leading by an instinctive blood craving that's hard to control.

Kaveh is a tall, slim and blonde man, his skin is really pale and usually cold since he's a vampire, though Kaveh hides it saying it's because of a medical condition, Kaveh's eyes are bright red like rubies, his hair is long enough to fall down on his shoulders, though he usually ties it up a bit, Kaveh is really pretty, kind and sometimes naive and reckless, Kaveh height is THE SAME AS ALHAITHAM'S and his body also has noticeably muscles though his body complexion is a bit more slender than Alhaitham's

Alhaitham is a tall man with naturally grey hair with some teal parts, his eyes were also teal with some copper red around his pupils, he had a pretty well built body and firm muscles despite being slim, he dislikes doing troublesome things but takes his jobs seriously, he's usually indifferent and remains calm in difficult situations and he cares deeply about Kaveh even though Kaveh mixes his kindness with pity and rejects Alhaitham everytime he tries to be closer, Alhaitham doesn't know why.