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This is Haruo Niijima's ki-type as officially listed in the guidebook. Probably, because he is neither a proper martial artist nor human.

Martial Arts
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Fighting Styles:	Boxing • Capoeira • Chinese Kenpo (Baguazhang • Chishōken • Hakkyokuken • Hikaken • Honshiken • Koppou • Qixing Quan • Tai Chi • Wing Chun • Xing Yi Quan • Zui Quan) • Command SAMBO • Go no Sen • Hybrid Martial Arts (Furinji Style) • Jujutsu (Ancient Jujutsu • Judo • Kushinada Style • Yamamoto Style) • Karate (Mutenkendoku-Style Karate • Shinchi Nengen-Style Karate) • Kalarippayattu • Lucha Libre • MMA (Ancient Martial Arts (Ogata Style • Tenchi Mushin Ryuu) • Asamiya Style • Kajima Style • Kanō Style • Shirahama Style) \| Muay Boran (Kick Boxing • Muay Thai) • Ninjutsu (Kōsaka Style • Kuremisago Style) • Pankration • Pencak Silat (Supreme Silat) • Personal Niijima-Style Escape Art • Savate • Shamyo no Ri • Street Fighting (Kitsukawa Style) • Sumo (Bufu) • Tae Kwon Do (Nyak Kwon Do) • Weapons (Archery • Axemenship • Bojutstu • Dual Wielding • Jojutsu • Kenjutsu • Swordsmenship • Scythemenship)
Techniques:
Ki Types:	Dou • Dual Ki • Ga • Sei • ★