Different anime and Video Games use the name Riku, so it depends on which Riku you mean.
In the Kingdom Hearts game series, Riku, the best friend of Sora and Kairi, is a protagonist trying to protect Kingdom Hearts.
In the anime/manga Blood+, another boy named Riku is friends with another boy named Kai and a girl named Saya. Riku from KH and Riku from Blood+ are very similar, both Sora and Saya are heroes with mystical blades, and Kai and Kairi are also very similar.
In the Final Fantasy X and X-2, Rikku, a 15-year-old female protagonist, is the daughter of Cid, the chief of the Al Bhed. Cid appears in Kingdom Hearts 2.
Wakatsuki Reijirō died on 1949-11-20.
Wakatsuki Reijirō was born on 1866-03-21.
Sara Wakatsuki was born on 1989-11-24.
Chinatsu Wakatsuki's birth name is Chiharu Kurihara.
Jeanne Wakatsuki Houston was born on September 26, 1934.
Aiko Wakatsuki was born on June 18, 1973, in Otsu, Shiga, Japan.
in california
Riku Suokas's birth name is Riku Tapani Suokas.
Riku Kemppinen's birth name is Riku Antero Kemppinen.
the name to distinguish KH1 Riku. Riku(normal) was the boy on the island, dark Riku was the heartless lord, with the armor previous to ansem, seeker of darkness infiltrating his body, where he is named Riku-ansem. Riku with the cloak is called cloaked Riku, and Riku that looks like ansem, seeker of darkness doesn't have it's own designated name. Claification, dark Riku is the Riku wearing the heartless armor, commands heartless and works for maleficent before ansem, seeker of darkness abducts him.
Riku
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