the difference between manga mc, manhua mc, and manhwa mc are...
"most" manga mc are portrayed as virtuous, they always kind even to their enemies. but they're kind of stupid that can be reasoned with. they're kind of polite character. ooh right, they're always chickened out if meet by any fc.
"all" of manhua mc are portrayed as cunning and can't be reasoned with. they're always have 9999 luck, while they climbing from 0 to 100. some even portrayed as mad and in my opinion it's taken over the line of anti-hero. they sometimes kill without reason.
"most" manhwa mc (in my opinion, because i mostly just read shojou genre for manhwa, and i just read the mostly popular shounen/seinen manhwa. but for the novel i read mostly shounen), they're a bit kind of manga mc but they're not the kind of manga whiny ass bitch, that make the reader questioning "why the fuck you didn't kill him/her?". i don't know what else i want to add...
in conclusion, a protagonist hero, a slaughter/massmurderer/a person who like to beating up people to death, a womanizer or cuckold master(well even manhwa sometimes have pornhwa vibe, even most of the novel).
maybe you can give me some other opinion....