I love the bromance genre. It's so funny and sweet. I am hoping to find a novel or manga/hua/hwa that cover that premise very well. Much like: Regressor instructional manual Return of the blossoming blade or Return of the mount hua sect Lookism The s class that I raised Mashle: Magic and Muscles Mairimashita! Iruma-kun Doctor's rebirth Trash of the count's family And more. Basically, guys who'll die for mc. Or even kill for mc. Whichever is good.
"Blade skill online" technically is a bromance, except everyone thinks it's a romance since they don't know the main character is genderbent. It's pretty weird but also funny Ex Rank Supporting Role’s Replay in a Prestigious School This one isn't what i would call intense, but i think it's more than Trash of the Counts Family, at least in terms of amount of friends
Omniscient Reader if you haven't. MC and second MC are very close. If you liked Lookism then Weak Hero is another comic that's quite good. MC fights unconventionally but is very cool. He forms a cool friend group as well.
https://coffeemanga.io/manga/the-greatest-estate-designer/ It has a novel too . The book protagonist is the knight of our current MC . And they are a chaotic duo . Impeccable bromance !!
Legend of Sun Knight Residence of Monsters Fu Xing Dong Lai Unique Legend Illusions, Lies, Truth Eclipse Hunter
I can recommend "Dusk Howler", from the author of "Doctor's Rebirth", but this novel is not translated. The English translator translated only the prologue and an excerpt from the first chapter of the novel, and then abandoned the translation.This novel was adapted into a manhwa that has been completely translated. The relationship between the characters in "Dusk Howler" is similar to the relationship between the characters in "The S-Classes That I Raised".