Zero

Let's say that you have a good business that provides you with money, a reverent love for cats and a huge house that has everything to accommodate cats of all the factions represented in the manga/anime.

(Actually, I just wanted to play with the designs and the plot in my head, but I love soukoku more than all the other BSD pairings, so I'll start with them for now.)

Cat!Chuuya

looks petite and thin, but he'll change your mind really quick!

he has a flexible body and precise, strong punches, which makes him a fierce, excellent fighter; he wouldn't get any scars no matter how the battle tough is

came from the streets and now lives with you (your food is tasty and nutritious, bed is soft and comfortable, and for gratitude he will protect your home by chasing other stray cats and dogs away)

prefers to hang out with "mafia" cats or being alone, but he would let you pet him sometimes

loves his little hat toy, doesn't let anyone touch it (you have no idea where he brought it from) -> cannot walk outside without his tiny hat

his ears are straight, but if he sees Dazai or spends time with him, he lowers them (works only with Osamu for some reason?.. does he show irritation like this?.. you don't really know, but you believe they are good friends)

has really fluffy, silky fur and beautiful tail, enjoys cleaning himself and spends HOURS on it to look perfect (despite not liking water, he would let you wash him if needed)

his purrs are rare and quiet, so you have to keep the recorder with you all the time to be able to record it!

likes the smell of many fruits, most grape or cherry

Cat!Osamu

you found him on the edge of dying, weak, injured and starving in trash can and decided to take him home

skinny body and long legs, although his fur is kinda short, messy and smells like grass and smoke

friendly and very clever cat, sometimes you feel like he understands your thoughts and the things you say to him… that spark of an intelligence in his eyes flees as he blinks

likes to talk and sing for you! you want to believe he appreciates you

asks you nicely to let him go outside… and will disappear for few days, but you don't search for him, he will back home anyway (experience.)

always gets in trouble, but somehow manages to come back alive! a huge dog chased after him? close, but not enough to be ripped apart. an ill-mannered boy threw a rock into him? Dazai's lucky he missed. got hit by a car? miraculously, not a single scratch.

never eats at home, perhaps hunting rats or pigeons, or begging for food from passerby (never got rejected, he's cute)

staring at you with no light in his eyes when you sleep… (probably he regrets of your burden of keeping his pathetic life)