Could be only one of those
It's OK if its not romance although I'd like it more if it was
For me the closest MCs are the ones from
Master Drifting Away Again Webtoon
Beware of the Villainess ( although not that chaotic but she's definitely unpredictable)
You are all dead if you touch my brother (if chaotic had another name)
This girl is a little wild ( her sometimes non chalant attitude brings me life)
Uglyhood
Kill the villainess ( not sure if she's chaotic but I just liver so much I had to bring her up
(づ ̄ ³ ̄)づ
well there's a lots female fighter and attitude
https://www.mangago.me/home/mangalist/1145002/
Bro even for a 2nd male lead Mr Wu is being treated like shit wtf XD
Give the kids their happy ending and find her M a better love interest or just give him to me :3
LMFAOO the author doesn't even give a fck about him which is funny