I don’t consider Holyland a classic delinquent manga. It’s more fighting/martial arts than deliquent. GTO is kind of the same, where the focus isn’t with the delinquent lifestyle. I enjoyed both of those immensely, but I didn’t enjoy most pure delinquent mangas (only exception is GTO prequel). Part of it is the style. I typically dislike mangas that are gritty and rough.
Manga
It's a Delinquent/Gang manga, it also has sequels.
GTO is a classic, although this time it's the delinquent turned into a teacher so it's not 100% about highschool delinquents.
As for Manwha, Transfer Student Storm Bringer was a fun read, and the reboot.
Wow I was just reading transfer student 2 days ago (the original of course) it was an extremely good misunderstanding comedy like angel densetsu but this time the protagonist is actually a wimp incapable of fighting. Also, what an ending arc it has!
GTO is definitely one of the greatest, didn't enjoy the actual delinquent prequel as much although it had a few entertaining storylines.
Wow I was just reading transfer student 2 days ago
The reboot was good as well, so you can check that out.
Honestly, I have heard only bad things before as it ruined the concept of the series, probably will check it since it's only like 16 chapters
I guess it's not as good, but it's still a decent read.
I prefer the live action TV series, but the Sukeban Deka series is great. It's about a high school girl who works as an undercover agent for a branch of the police that investigates crimes that take place at schools that regular cops aren't allowed to investigate. Unfortunately, very little of the franchise has been officially released in a English. ADV released the OVA in the 90's. The 2000's movie reboot got a release too, but that was the worst version IMO.
Yankee-kun to Hakujou Gaaru is one of my favorites. It's by no means a complex story, but it's sweet, and it appears to portray blindness pretty accurately.