Will Yokohama's Black Sludge Become a Great Writer?

Question: Will an amnesiac black-mud monster destroy Yokohama?

No, he’ll just splash black mud everywhere.

Baichuan Ze isn’t an ordinary person in the usual sense. He thought he would spend his dull life in a dull way. Then one day, he transmigrated.

Baichuan Ze: Wow, subarashii~

The brilliance of human nature is like a shot of adrenaline. Boosted by this buff, Baichuan Ze outsmarts the King of Arms and devours the black mud, punches cursed spirits and kicks evil ghosts, all while making a name for himself in Yokohama.

Just when he thought he could keep having fun, the worlds merged.

Baichuan Ze: Meow meow meow???

Some Bandage Freak: Long time no see. Have you been happy? :)

I-I guess?

Some Hat Rack: So you defected without a word because you wanted to be like that mackerel? (laughs)

I didn't! I didn't! I was wrong QAQ

Some Spicy Curry: Hmm, Dazai seems to be looking for you. I gave him your current address.

Thanks a lot QwQ

Some Smiling King of Curses: Weren't we supposed to stay behind and share the paperwork after we changed the jujutsu world together?

Thanks, but keep your best friend away from me.

Baichuan Ze: Great Master Akutagawa, sob... Yokohama is terrifying. I want to go back to the library QAQ

Worlds involved for now:

Bungou Stray Dogs, Jujutsu Kaisen, Demon Slayer, Bungou to Alchemist, with a little of that stone-slab world and the Holy Grail (but not much, just background scenery).

Important warnings:

1. Pairing undecided, and it might be a no-pairing, everyone-dotes-on-him story. I can't decide who the pairing will be, so I'll leave it up to him.

2. There are original settings and OOC characterization (it's a lighthearted story, after all).

3. The protagonist is a black-mud-covered madman. For reference, think Dazai + a bit of Ranpo + an honest, earnest guy.

4. That's probably all for now?

Theme: Becoming a better person