Voiced by: Kazuya Nakai (Japanese); Steven Blum (anime), Liam O'Brien (PS2 video game dub) (English) Mugen (ムゲン（無幻）) is a 19-year-old man who is one of the main protagonists of the series. He was born in a penal colony on the Ryukyu Islands which in the Edo period was a separate kingdom with close ties to Japan's Satsuma domain.