Decadus, is a super masochistic middle-aged man who fights with his fists and has a well-trained body.

When compared to the other disciples, Decadus has a fairly normal personality. He is described as a "perfect gentlemen" with his duties as a disciple, and always speaks in a polite and mannered style. Even when he is angry, he refrains from ever swearing or belittling his opponent, putting him in sharp contrast with Dito or Cent. He is also loyal in a way that none of the other disciples are: until she is killed, he is fanatically loyal to Four, and shows a similar loyalty with Zero. 

However, even when in the presence of his former Intoner, his loyalty to Zero does not waver. He is also the one disciple that Zero doesn't actively lash out at, except when she is speaking to the group in general.However, alongside this, he has a darker side: he is an extreme masochist who turns pain and agony into his personal reward, whether it be in battle or as part of his personal duties to Intoners. His original desire to serve Four was strengthened when she asked if he would die for her, an offer which he found very arousing. While he tries to keep his preferences mostly under cover, he often lets some remark slip out, alerting the others. He even takes the visible signs of sexual arousal as a shame. It also ends up interfering with his duties to Zero, who at one point chastises him for his repetitive requests for "punishment".

English VA - Cam Clarke