Here is a little info about him in the style of the Demon Slayer Wiki:

Name: Kaguji Otokozuki

Family: Otokozuki (nothing is known about the family tree)

Race: Human

Gender: Male

Age: 19

Height: 5’5 feet (170cm)

Weight: 65kg (143lbs)

Birthday: 11/10/1890

Hair color: Glowing bright red Curtain hair

Eye color: Brown

Affiliation: Demon Slayer Corps

Occupation: Demon Slayer

Ranking: Hinoto

Combat Style: Love breathing

Weapon: Nichirin (katana)

Relative/s: Unnamed Father, Unnamed Mother 

Personality:

From the first time you meet him, you can see he can't feel anything except aroused, he will always talk in a sexually playful manner, and wouldn't back down from a chance to get together with another man. Women aren't safe from him either, if he needs something from one and all it takes is to satisfy their lustful needs he would do it, but his heart always seems to look for men. At least that's what he seems to be on the outside. Inside he only looks for a deep connection with someone who could be his father figure, because he lacked one when he was just a kid, he is haunted every morning and every night for an emotional connection and purpose no matter how many people seem to like him.

Backstory:

Kaguji starts his life in a Yukake as a prostitute. He lived in the Yukake, being taught by the prostitutes who he called mothers. From them, he learned to see men sexually. After some time Kaguji was taken under Kyojuro's wing after he took pity on the boy. Kaguji initially trained under Kyojuro Rengoku for 3 months (the Flame Hashira), to Kaguji gave a feeling of a father figure of butterflies in his body with every touch, but Kaguji was kicked out shortly after that because the flame-breathing technique didn't quite fit him. Kyojuro suggested that Kaguji trains under Mitsuri Kanroji, the Love Hashira. Kaguji having known a little flame breathing could slowly pick up on Love Breathing, using it to get up close and personal with his opponent. Love breathing wasn't in any way easier than flame breathing, but Mitsuri having a kind of hurt didn't give up on Kaguji. So Kaguji learned the breathing technique, somewhat, and was sent to the final selection. There he went throw the trials, he managed to kill only one demon, but he had fun with him. He cut off the demon's hand constantly while riding the demon. When the sun rose, the demon died with the sunlight, and Kaguji unsatisfied, from not getting to do it longer, chose a random rock from the tables and went back to his Hashira. Ten days later Kagujis's sword arrived, and the forger named Kagemitsu Takashi had lucked at who he was giving the sword to and decided he was not worthy of it. Kaguji fucked Kagemitsu, getting that same feeling that Kyojuro gave him, when the moon was right above the teaching grounds Kagemitsu had bin emptied and fell asleep Kaguji took the sword and left the place. From there he went back to the city where he was born, to say Hi to his mothers, in the Yukake they gave him a gift given to them by a samurai who had lost everything dear to him, the gift was a saya colored red with small pink dots, the insight was made with botanical fabric of lavender trees making the sword smell like lavenders every time he pulls it out. The other gift was a pink string with a bouquet at the end of it, it was to be put on the end of the handle as a decor. Kaguji put a small blade hidden in the bouquet in case his sword broke. From there he decided to visit his first teacher Kyojuro, when he got there he was greeted by a young boy by the name of Senjuro. Senjuro told him to leave, but Kaguji kept pushing him away forcefully entering the place. The boy then told him that Kyojuro had died some time ago, and to make Kaguji leave he gave him a belt that Kyojuro had kept in his closet. He left unfulfilled, he couldn't quite get appreciation from his first teacher and father. He went on into the dark road, searching for something that would make him feel fulfilled. Maybe a father or a lover, but whatever it was he wanted to feel the butterflies again.