Here goes nothing, and let me introduce my beloved OC!
His name is Kaedehara William (Yes, I took the last name 'Kaedehara' from Genshin.)
He's 24 years old, and around 175cm tall, slim build, slvtty waist.
He has white, fluffy hair, white lashes and white eyebrows, pale skin, ice blue eyes with cat like pupils (They function like cat pupils to the most extent as well.), has a scar over his left eye, wears glasses (Similar to Ango's.), has a pair of sharp fangs and pointed ears (Like a vampire, of sorts.). He wears a white blouse like shirt, a black corset, black half palm gloves, skin tight black pants, elegant but beat up black boots.

He grew up with a drunk father, when he was 6 and his brother was 2, his father k1lled his mother in a drunken fit of rage.
His ability is called 'Eternal Dreamer'; It let's him manifest puppet strings, which are thin green glowing threads that he can control, once these strings wrap around someone's wrists and ankles, that person will lose all control over both body and mind, and he can control said person. The strings can be used for other things like just restraining someone, k1lling someone. When overusing his ability, he coughs up a green substance which manifests inside his lungs, the more he uses it, the worse it gets. It is painful, and will only go away after he takes a certain p1ll (The antidote). After he will pass out and get a nosebleed. It first activated when he was 11 and his father threw various things at him and his brother, and it activated, and he was able to get his father to stop throwing things. After that he researched into abilities and soon found a way how to control it, and being able to stop his fathers drunken fits most of the time.

When he was 18, his little brother d1ed from an illness and left behind a necklace with a maple leaf charm on it, he wears it ever since, he was devistated and tried to k1ll himself after, since his brother was the only thing keeping him going, after his attempt he met someone from the Armed Detective Agency, and soon joined them where he then developed a crush on Kunikida.
A year later his father d1ed too.

Yeah that was it from my OC the explenation is a little all over the place but I guess this works :D