One of the infamous 'Twelve Kizuki', the Demon organization created and ran by the Demon King, Muzan Kibutsuji.
Akaza holds the position of 'Upper Rank Three' and is one of strongest of the Twelve.
He possesses enormous power and relishes in challenging others of similar strength to continuously hone his fighting skills. From the Mugen Train movie he is seen using solely hand to hand fighting skills.
