Ninja Ninja

Ninja Ninja (ニンジャニンジャ, Ninja Ninja) is apparently the deuteragonist of the series (the main protagonist being Afro). In the official concept art he was credited as Ninja Ninjaman (ニンジャニンジャマン, Ninja Ninja-man). He is one of the most mysterious characters of the series, as he is known to suddenly appear or disappear at particular moments almost as if he was always or was never there, be it during a battle Afro is caught in, or when Afro seems to be almost completely alone.