(Sorry it took so long to reply – I wanted to do this ask justice!)
If I had to choose a word to define Chuuya, it would be Passion. Passion specifically refers to strong emotion, though what emotion is not attached, and I think that fits very well for my personal interpretation of Chuuya.
He’s passionate in his angry, in fighting and completing his missions.
He’s passionate in love.
He’s passionate in caring for others.
He’s passionate in his own personal identity (fashion, appearance in general)
He’s passionate about protecting his family
He’s passionate.
Chuuya’s like a fire, crackling and burning in every which way. It can burn, but it’ll also warm you up. He can be a good thing or a bad thing, or anything in between, and it all depends on what you mean to him. He’ll punch you with the same hurrah as he’ll kiss another, he’ll dance and drink and have the time of his life, and completely wreck a criminal organization the next day. He’ll cut someone’s throat, blossom their eye socket with a dark blue rose, or he’ll wrap a scarf around them, make them talk.
Chuuya is often acknowledged for being fierce and badass, while also compassionate and helpful. But there is a connection to those – he does every act in his life with as much passion as the other.
Tag: text
[Dazai meeting Chuuya for the first time]
Dazai, dreamily: He took my breath away . . .
Akutagawa: . . . Wasn’t that because he kicked you in the stomach after you called him ‘short’?
Dazai, arriving in a stolen car: Come on, get in! I got us some new wheels!
Chuuya: Good, my bike blew up. How much is this gonna cost?
Dazai: Two years in jail if we don’t get moving.
Chuuya: *is drunk and watching tv*
Chuuya: No, you stupid moron! Don’t go into the Church!
Dazai: What are you watching?
Chuuya: Our wedding video.
Dazai, winking: I guess you could say I’ve . . . Fallen for you.
Chuuya: You literally just rolled down an entire flight of stairs in your latest suicide attempt, how are you even alive –
Dazai: did you miss me?
Chuuya: with every knife so far
Akutagawa: Are you feeling alright, Chuuya-San?
Chuuya: I seem to have a headache that comes and goes.
Dazai: *enters the room*
Chuuya: It appears to be back.

Fifteen (First Meeting Novel): Summary with Short Excerpts
This post is more than 13,000 words long.
1. I have not put any warnings on this post; that does not mean there aren’t possible warnings. If you’d like to know specifically what these trigger warnings are, please privately contact me. For those who proceed, please do so at your own caution.
2. Please do not repost. Please do not translate into another language.
3. I have translated only those excerpts I wanted to. If you’d like to send asks, please kindly refrain from asking me to translate a certain part or other.
4. If you want to wait for a full English translation, reading this post will most likely, most definitely, take away some of the excitement of reading the novel.
5. Once again, same encouragement for movie posts applies: tag responsibly and place all discussion under a ‘read more’, try to keep your tweets out of the public search engine (I also recommend using fusetter); please be especially careful if you have followers who do not wish to be spoiled. Please be especially careful that this does not spread to any of the Japanese fandom, which errs on the side of caution and keeps all spoilers out of view.
title: playing the pet
ship: dazai osamu/nakahara chuuya
rating: T
AO3 link: here!