Shinichi was a Kitsune and also Misao's twin brother.
In his human form, Shinichi looks like a young and beautiful Japanese boy with pitch black hair, red all around the tips and golden eyes. In his real shape, he has more than six tails and black and red fur. His personality is twisted and evil. Both he and his sister can change into any shape that they want.
At first, he appeared as a dark and mysterious person, who offered a partnership to Damon in order to destroy the entire Fell's Church. With the influence and help of Damon, Stefan is lured away from the town with the promise of becoming a human again. Shinichi and his twin sister, Misao, used terrible tentacled creatures, which can be the size of a pinhead or big enough to swallow your entire arm, to make Damon one of her pawns. The malach entered his body and took him over from the inside, corrupting his body and his soul, making him entirely under Shinichi's will. Shinichi made Damon torture Elena and even kidnap her, making her believe that Stefan wanted her to be under Damon's care, while he and Misao spread the malach like a virus among the citizens of Fell's Church.
He and his sister die in The Return: Midnight, after saying that they regret taking the mission to destroy Fell's Church.
Shinichi is the Japanese origin and the meaning is "One Truth", however, it can have many different meanings depending on the kanji used.