(Warning: some may contain dark themes/images)
Clover (tetsuhiro Hirakawa)
Crows
Lookism
Kiichi!! (gets more delinquent-y later on and in the sequel, but is still a fantastic read)
Jojo's Bizarre Adventure (there's an anime series as well, dives more into delinquent/gang type stuff later on in parts 4-6)
Slam Dunk
Worst
Out (Makoto Mizuta)
Kyou Kara Ore Wa!! (this one also has an anime)
I've read all of this lmao
I've read all of this as well lol except crows
[I tried reading jojo but I am very picky about the art style so I never get through it, I heard its good so I'll try to read it again thx]
Any manhwa/manga recommendations like school delinquents, bully [Tokyo revenger, windbreaker, weak hero, any ptj manhwa ], or even assassination [assassination classroom, sakamoto days, teenage mercenary]
Like at 100 chapters or finishes one would be nice cause I'm reading 4 different manhwa/manga and I'm not enjoying them