Bim

Height: 176
years old: unknown
Hair color: black
appearance:
In his normal state, Bim has the appearance of a young man with well-developed muscles, in place of the upper part of his face there is a shark's snout with gills and fin; there are no visible eyes. He has short black hair on the back of his head and sharp shark teeth. He only wears beach shorts. There are probably no underpants under them either.
When Bim undergoes a partial transformation, his head increases significantly in size and looks more like a shark, with the exception of three different pairs of eyes and many sharp spiked fins on the top of his head.
In its fully transformed form, Bim is devoid of human features and has the appearance of a shark with two pairs of fins serving as legs, and, in accordance with the partial transformation, three pairs of eyes and sharp spiked fins on the upper body.

Bim has an eccentric and flighty demeanor. According to Makima, he is usually "so aggressive that it is impossible to talk to him." He likes fighting, and he's happy to kill and eat a bunch of zombies. Although he was afraid to fight the Demon Bomb, he did not hesitate to fight back, finding himself in a dead end.
The most striking and frequently repeated feature of Bim is his great praise and adoration of Dengi. As soon as Bim saw him, he rushed to hug Dangi, calling him "The Chainsaw Man," after which he was brutally rejected - but this did not change Bim's feelings towards the Chainsaw Man. Bim wants to obey the Chainsaw Man, calling him "the strongest" and being ready to carry out any of his orders, which is why Danji even suspects Bim of homosexuality. However, it is much more likely that Bim's blind adoration of Dangi is not sexual in nature, but comes from the fact that Bim was previously acquainted with the Deceased, and, like other demons, worshipped him. Makima hints at this by telling Denji that he "resembles someone" to Bima. Bim agrees with Dangi, no matter how crazy his plans are: when Dangi misinterpreted the advice to use chains and decided to ride Bim like a horse, Bim hesitates to argue with him and obeys.
It was shown that Bim, like a Shark Demon, loves moisture; he was overjoyed when it started to rain heavily.

Increased durability: The beam is very durable for a fiend and is able to withstand several point-blank blasts from the Cut, and at the same time remain in good enough condition to escape later.
Demonic abilities
Intangible: Bim has the ability to "float" through solid objects, which allows it to easily pass through walls and floors. It doesn't look like he can carry others or large objects with him.
Shark Transformation: Bim can transform his head into a shark with multiple eyes and great bite force. The complete transformation brings Beam's entire body to his Shark Demon form.
Blood consumption: As a fiend, Bim is capable of regeneration through blood consumption.
Revival: As a demon, Bim is reborn in Hell after his death in the human world, making him virtually immortal.