Emiko's husband is the shy and thoughtful Kosuke Niwa. He married into the Niwa family and adopted the surname; he himself is not a Niwa male. He knows a lot about magic and had journeyed often, hence he has not seen his son for many, many years. When he finally returned, he gave Daisuke a Rutile which lets him absorb all the damage received by Dark .    He is currently searching for the secrets between the Hikari and the Niwa family. He is very serious when he needs to be, but generally he seems clumsy, exactly like his son. He is easily embarrassed by his wife, Emiko, and her antics. Kosuke was also one of the few characters who arrived late into the series and his true surname is unknown.

Niwa Daisuke is your average teenager, until his fourteenth birthday. He tries to declare his love to the girl of his dreams, but fails. Suddenly, whenever he thinks about this girl he turns into the legendary phantom thief known as Dark Mousy. Daisuke's mother, very much aware of this, makes him turn into Dark and steal valuable works of art for a purpose unknown to Daisuke. As the story unfolds, he learns why, and about his classmate who seems to have the same ability.
 
(Source: Anime News Network)

__Height:__ 178 cm

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**Non anime roles:**
- Shadow Moon - Kamen Rider Black (TV Series), Kamen Rider Black RX (TV Series) and Kamen Rider World (Movie)

Daisuke Niwa is an ordinary, if slightly unlucky, middle school student. On his fourteenth birthday, he comes down with a 'condition' that has plagued the men in his family for three hundred years. When he sees his crush, Risa, he transforms into his alter ego, the phantom thief Dark Mousy. Unfortunately, when Dark Mousy sees his crush, Risa's twin Riku, he transforms back into Daisuke. The only cure for this craziness is if Daisuke can get Risa to fall in love with him ... 

(Source: Tokyopop) 

Included one-shots: 
Volume 1: Namaiki no 'N' (N is for Nishiki) 
Volume 2: OumagaAGAIN (The Demon Returns) 
Volume 4: Kanno-ke wa Kanai Anzen. (Protecting The Kanno House) 
Note: Includes 5 extra chapters.