Yuma is a very tall young man with messy dark blonde hair. He usually has it tied up in a bun with bangs and some strands hanging out from the back.
He usually wears a long- sleeved white V-neck shirt with a black trim towards the top along with a black sweater. He wears it with brown pants. He also wears a necklace and bracelet on his left arm. The voice, body, and attitude of this rebellious do-S are all big. He often goes on rampages, but he falls asleep after he becomes bored. He can always be found munching noisily on sugar cubes. He is very sadistic and rough and also quite perverted and hot-tempered.
As a child, he was very lively and cheery. Sometimes too rebellious to his parents who were religious people while he didn't believe in God. After the incident and his amnesia, he had to become even tougher if wanted to survive out on the streets with the other members of his rebellion gang. He grew violent, rough, and dominating with time.
In one of the first magazine issues that spoke about him, it was revealed that Yuma doesn't mind consuming the complete body of his victim alongside draining the blood, and this was suggested as the main reason for his physical strength growing even above the average impure vampire.