is a Japanese mixed martial artist competing currently for Rizin Fighting Federation, grappler, and former police trainee currently competing in ONE Championship's lightweight division. He is noted for being the DREAM Lightweight Champion, ONE Lightweight Champion, former WAMMA Lightweight Champion and former Shooto Welterweight Champion. Aoki holds a black belt in Brazilian jiu-jitsu under Yuki Nakai, as well as a black belt in judo. As of 2008, Aoki, along with DEEP champion Masakazu Imanari, and Sengoku champion Satoru Kitaoka have founded the "Nippon Top Team" as a group of elite Japanese grapplers competing in MMA. As well as his MMA credentials, Aoki has garnered several submission grappling accolades including two All Japan Jiu-Jitsu championships, a Japan Open Jiu-Jitsu championship, a Budo Open championship, and an ADCC Japan Championship.