Python, spider, and the like

Ernest and Alexander's line:
Ernest and Sasha met on a dating site, but Ernest didn't know Sasha was a guy, so he was shocked when they met in person. But they maintained a good relationship and became close friends. They live together.
Line of Valentin and Semyon:
Semyon's wife left him and took their child with her to live with Semyon's corrupt boss. Semyon decided to take revenge and brought in Valentin. Valentin helps Semyon put Semyon's ex-wife's new husband in jail, and Semyon helps Valentin regain his work permit, which he lost after being falsely accused. They are in a semi-romantic relationship.
Ernest and Valentin's line:
Valentin and Ernest have been best friends since they were sixteen. They know everything about each other.

He appears as a man with dark gray skin and white hair. He has sharp fangs and very thick saliva, from which he literally weaves webs. His eyes are bright red. Spider legs grow from his back. Under each human eye are three small, blind, and always closed eyes.
Who are arachnoids?
The term "arachnoid," referring to a humanoid spider, was coined by H. P. Lovecraft. These dangerous and poisonous creatures lure their victims with pitiful or tender words, then constrict them.
Character:
Cunning, selfish, and deeply unhappy before meeting Semyon. Now he's more of a cheeky type.
Likes: Alcohol, Semyon, rock music.
Dislikes: cleaning.
Phobia: none. There is a natural reaction (from surprise, at high speed, etc.), but there are no specific phobias.
Hobbies: Can play the guitar, but rarely takes it out.
Job/specialty:
Trained as a chemistry teacher. Currently unemployed.

Alexander Byrkov (Firebird)
Red-haired guy, 17-19 years old. Golden eyes.
Bird's legs, wings growing on the arms,
luxurious bird's tail. On the head
The hair grows in a patchwork of feathers. The feathers are golden and burgundy.
Who are the Firebirds?
Origin: Russian folk tales. Beautiful but dangerous birds. Their feathers are especially valuable, bringing good luck and curing any illness.
Personality: hot-tempered, pugnacious. A real thug to the core. Likes: tea, Harry Potter movies.
Dislikes: spirits, being called a phoenix, rooster or Indian.
Phobia: afraid of swimming.
Hobbies: Reading comics.

The upper body is human. An albino guy, about 25-30 years old. He wears glasses. The lower body is snake-like. The eyes and tongue are snake-like.
Who are the Nagas:
Origin: Hindu nifs. They are the guardians of the tombs and treasuries of emperors and gods.
Personality: Calm and kind with friends. Cruel and caustic with enemies.
Likes: tea, perfume, erotic literature.
Dislikes: chaos, heat.
Job/occupation:
Education: pedagogical.
Works as a dentist in his own clinic.
Phobia: There are no specific phobias.
Hobbies: Collecting tea, reading books.

He looks like a guy, about 20-25 years old, with light brown, tousled hair. His eyes have no irises or pupils. His teeth and nails are elongated and pointed. He has a dog-like sense of smell and hearing, and some of his habits are similar.
Who are the hellhounds:
It's unclear where exactly they came from, but creatures similar to them appear in many fairy tales and mythologies. The hellhounds' main purpose is to capture prodigal souls and send them to the afterlife, as well as guard the border between worlds to prevent the living from joining the dead. They typically serve the God of Death and can tolerate the worst treatment.
Character:
Serious, loyal, noble. He believes that if the goal is to protect the law and people, then it justifies any means.
Likes: Order, son, father, work.
Dislikes: Chaos, liars.
Phobias: A bit of an insectophobe.
Hobby: Motorcycle driving.
Job:
Police officer.