So, this is "when he sees you naked" (I also took off Yasuhiro and TeruTeru. Sorry j just am not comfortable with writing them. Next to go, you should vote. I'm also gonna add Izuru as his own entity and not in Hajime's portion anymore.
Kazuichi
Leon
Ryoma (mood always)
Kaito)
Pls vote.
Byakuya
He'd just stand there awkwardly adjusting his suit before leaving. Doesn't even say sorry or anything just stops, stares, and leaves.
Mondo
He'd act the same. He'd just talk to you casually while you're naked. Like, you'll be changing and he'll pop in like
"Hey, y/n, so you wanna hang with me and my bros today?"
"Sure please leave."
"Oh, sorry. How are you?"
"Fine. Now, please leave. I have to change."
"Okay, okay!"
Kiyotaka
He'd blush, apologize, mutter a tiny "wowzers" and leave. Then, he'd look at your chest and just stare.
Makoto
He'd freak out. Literally, he'd scream and slam the door, then run away screaming apologies.
Chihiro
He'd be comfortable with it. He'd be shy at first but he's like "eh whatever, it does not matter," you know? You are also comfortable with Chihiro because you know he wouldn't try anything.
Leon
"Oh hey, tits."
He'd literally try to cop a feel. If you're a dude (doubt it but okay) he'd try to grab your ass or your dick or smth.
Hajime
He will get shy and flustered, say sorry, then leave.
"Hey y/n so I was wondering if y- oh my god! Uh, sorry.... I'm just gonna... Leave..."
After, it'll take an hour or two for him to even look at you in the eyes.
Izuru
Probably the most normal. He'd be quiet, say what he needed to or grab what he wanted, and leave. He'd apologize in the way out, obviously. He isn't a creighton.
Nagito
The first time, his nose literally bled. Your back was facing him so you didn't see but you heard his footsteps thump away. After, he was on the couch, tissue in his nose, chin up, and blushing.
Gundham
He'd be comfortable but.... Not? It doesn't make sense but it does?
Kazuichi
Same with Leon, except he'd just stare at you. He'd literally freeze.
Fuyuhiko
Same with Leon.
"Hey, boobies."
"Mwa mwa milky"
Will run head first into your chest.
Shuichi
He'd shield his eyes from embarrassment, profusely apologize, and then leave. Like Hajime, he'll be all shy and won't look straight at you. He'd look down and away.
Rantaro
Like Mondo, he'd be chill. I hear you, fellow Flamingo fans. S T I L L C H I L L
Rantaro would sit next to you and just conversate like you aren't naked.
"So, like, what do you wanna do today?"
"Change without you being in here talking to me so I can change clothes in peace."
"Sorry, love."
Gonta
Apologize like a gentleman.
"Y/n, have you seen Gonta's bug friends- sorry! Gonta knock next time!"
"It's fine."
"No it not! Gonta not a gentleman anymore!"
"Yes you are. It's a mistake and I forgive you. Please get out so the cold air doesn't come in, though."
"Okay. Have you seen bug friends though?"
"No."
Ryoma
He'd be too short to see anything above the bed frame. Also, he's too short to reach the handles.
Korekiyo
He'd stare at your body heavily. He'd examine it with his eyes, nod his head in approval, then leave without saying a word.
Kaito
Like Shuichi, Kaito would flip out. He'd shield his eyes, look at the floor, and slam the door in his face. You'd look over your shoulder to see Kaito on the ground and the door in his face.
Kokichi
"Nishishi~ Nice tits, sweetheart!"
You'd glare at him.
"Get out."
"Awwe..... Okay...."
He wouldn't talk to you until you let him look at them again and feel them.
Kiibo
He'd buffer and freeze.
Human Monokuma
He'd watch you on the cameras he has around the house.
Servant
"O-oh, I'm sorry...."
"Uh... You're fine. Can you uh, leave."
"But... I don't want to. Can I stay and enjoy the show?"
"Dude!"
"Yes?"
Nagisa
He'd apologize, get/say what he wanted, then leave. No overreactions here.
Masaru
"Oh wow boobs!"
He'd try to feel them, like Leon.
Jataro
He wouldn't be able to see so he'd only tell if you scream or something. Now, he looks at the floor and he doesn't dare go in the room when you say you're changing.