Who is Kouu the tyrant king? I'm reading the manga "Reincarnation no Kaben": there, the main characters get some powers from their previous lives, and hence are named after famous people of history. 

I managed to find all of them except who the main antagonist should be: he is named after "Kouu the tyrant king". Does someone knows who the historical character they are referring to is? (Or is it a made up character?)
I think is a mistranslation. 
According to this site: http://tyuumokuneta.net/post-1718-1718 the original name in the manga is 項羽 / Xiang Yu, an ancient chinese warlord.