Did the artist say that is Mugen, it just doesn't look like him to me.

I agree, but he's the only real bad-ass in that show that Flan could even come close to liking.

I believe it's a character from King of Fighters, but I've never played it so I can't tag him by name.

note;
this team's name:
死の恐怖(the fear of death)

entry:
コンボムービー杯　タッグトーナメント(the combo movie cup, tag tournament)

character:
Flandre Scarlet (by Kurogane)
Cloud Awe (by Rikard & Dark Cloud)

gist:
teaming up MUGEN original characters with Copyright characters.

This artist seems to have supported this team.