The Temple Demon is a male demon that has pale, ash gray pigmented skin with two green stripes around both of his biceps and legs. Bloodshot in the eyes, and black pupils with no irises. He has spiky shoulder-length murky green hair with bangs parted at the center. Common to demons, he possesses fangs and sharp nails.
The actual answer is a little more complicated, but essentially no, Genya is not a demon. According to the source manga: "Genya has a special ability. For a short amount of time, he can become a demon using his bite strength and his special digestive organs."
Prior to becoming a demon, Daki/Ume is a young girl with white hair and bangs. Her eyes were lapis blue (green in the manga) and her skin is very pale. She wore a light pink kimono with white square patterns. She is said to be so beautiful that even grown adults would be shocked at the sight of her face.
Gyutaro is a large man with pale grey skin and black dots and mist shaped marks appearing all over his body. He has short wavy hair which starts out black then fades to a lime green. His sclera are an unnatural colour of yellow and his irises are dark green with the kanji for Upper Moon Six written on.
Mitsuri Kanroji is a 19-year-old young woman with bright green eyes, with long eyelashes and a small mole. She has long pink hair mixed with neon-green paint, wearing three thick braids and five shorter clumps falling over her nose like bangs.
Toho Co., Ltd. Black is the most mysterious color of all the blades, and is held by the main character, Tanjiro. It is a rare blade and represents the sun; it also holds a theory that the demon slayers who own this sword are not to live a long life.
The Breathing that inspired many other techniques is represented by the green sword color. Wind is the element of the green Nichirin blade and Sanemi Shinazugawa is the one who wields it in Demon Slayer.
Does Muzan have a favorite demon? Despite the fact that Muzan. is always shown to have disdain for his creations, Muzan does in fact have a favorite. On that list is Naki, made due to a convenient blood demon.
Sensing their despair, Doma offered a chance to him and turned both Gyutaro and Daki into demons.
Overall Abilities: As the secondary holder of Upper Rank Six, Daki was an extremely powerful demon, having killed and devoured seven Hashira in the past.
Her background as a courtesan coupled with her beauty meant that she would serve as a great and reliable source of income for Muzan, which is why the Demon King decided to be tolerant of her apparent stupidity.
With the help of her Obi, Daki would trap her prey and store them inside the Obi. This allowed Daki to consume the trapped people at her leisure.
Muzan is shown to have a positive master-servant relationship with Daki, as the young Demoness seemingly worships and admires the Demon Progenitor immensely, fervently hanging on each and every one one of his words and doing her absolute best to accomplish the tasks he gives her.
In the simplest terms, the reason that Genya can't use Breathing Styles stems from his inability to achieve the total concentration breathing that other demon slayers use in order to access their abilities.
Genya is the first of all Grisha to share her specific talent, and she is curious, knowledgeable, and kind. But she is also tool used by the Darkling to endear himself to the royal family by gifting her talents to the queen (and making her body easily accessible to the king, who sexually assaults her).
Apart from that, Muzan doesn't hate Akaza because of his obedience. The only Demon he despises the most is the Upper Rank Two: Doma.
Inosuke Hashibira
Although Inosuke refuses to acknowledge that he has met him before, Doma explores his memories and reveals that he met Inosuke when he was a child, and was responsible for killing his mother, causing Inosuke to fill with hatred and engage in combat with the Demon.
After Akaza's death, Doma says that he felt as if the Upper Rank had turned into a different creature before he died, and that his demise is inevitable because he never ate any women. Doma begins to cry over his 'best friend's' death, but Kanao just tells him to stop with the lies.
With his blood, Muzan can turn others into demons and seems like an unstoppable foe. However, the demon king seems to fear one thing: Tanjirou's hanafuda earrings. A look into Muzan's past reveals that only one man ever came close to killing him.
The Anti-Kibutsuji Drug is a special four-stage drug that was created by the combined efforts and medical expertise of Tamayo, Yushiro and Shinobu Kocho with the main purpose of annihilating, Muzan Kibutsuji.
The sword is primarily black, but it turns crimson red when the Breath of the Sun God (strongest breathing style) is used by both Tanjiro as well as Yoriichi.
However, the scar changed its appearance during the Final Selection when the Hand Demon gave Tanjiro a major blow to the head. The blow not only increased the size of his scar but changed its colour as well. The scar changed even more when Tanjiro fought against Gyutaro and Daki during the Entertainment District arc.
Shinobu Kocho is a capable Demon Slayer whose worthy of being the Insect Hashira. That being said, she's arguably the weakest Hashira when it comes to pure strength.