User blog comment:Kurare/Zero Division powers & inventions theory/@comment-5693502-20140930133245

Like everyone's said the Royal Guard members' inventions have been mentioned (except for Shutara). I personally feel like Oshō was the one who ushered in the art of Kidō and Hohō was created as an extension of Hakuda-like body techniques (who by, I am unsure). I don't think Hakuda was created by anyone specifically (since it's just body skill fighting techniques); I'm more under the impression it resulted from multiple Shinigami who were just very proficient in unarmed combat.