M'Wanu is a witchdoctor and follower of Moogoo. After the peace of the Golden ox, he was deported from the Jungle but has come back several times to cause issues with the 3rd Phantom but also the jungle.
He is a tricky, smart man who knows how to use natural poisons in various guises to distill fear in the Jungle.
He is like the yin to the 3rd Phantom who is yang. The 3rd Phantom uses tricks to build on the legend and M'Wanu uses tricks for ill gain.