Hideki Ryuga is a celebrated Japanese singer and screen actor who headlines his own TV program. His biggest part in the plot is indirect: he is the genuine owner of the name L borrows as a false identity, a pick that quietly doubles as a trap for Kira.
His hair is a shaggy yellow-green that hangs to about neck length, with a fringe spilling across his eyes. Slim and standing tall, he reads as good-looking to a wide swath of female admirers.
Within the story Ryuga functions as a genuine celebrity crush, a beloved performer with devoted followers like Sayu Yagami. Little of his inner life surfaces; he stays largely a glossy public figure, the desirable idol and leading man.
At first Ryuga exists only as a televised face, in a program Sayu Yagami follows so devotedly that she objects when Light moves to switch it off. He matters once L picks his name as a pseudonym: deciding to step into the open before Light at the welcome ceremony for To-Oh University, L hides his identity behind Ryuga's name. The choice doubles as a snare, since testing the false name in the notebook would likely push Light to envision the real idol and kill him, exposing himself as Kira. Ryuga appears in person only briefly, when Misa Amane is cast opposite him in a film and, faithful to Light, refuses the scripted kiss to the director's irritation. He is last seen at the NHN Pop Music Festival, where Kiyomi Takada introduces him alongside the ensemble of his coming series Ryouma Sakamoto, with Ryuga slated to star as Ryouma opposite Ami Hamazaki as his on-screen love interest.

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No. In Death Note, Hideki Ryuga is a genuine, famous singer and actor, and L merely borrows that name as a false identity.
L adopts the name Hideki Ryuga at the To-Oh University welcome ceremony to step into the open before Light. The choice doubles as a snare, since testing the false name in the notebook would likely push Light to envision the real idol and kill him, exposing himself as Kira.
Hideki Ryuga is a celebrated Japanese singer and screen actor who headlines his own TV program. His biggest part in the plot is indirect: he is the genuine owner of the name L borrows as a false identity.
Hideki Ryuga appears in person only briefly, when Misa Amane is cast opposite him in a film and, faithful to Light, refuses the scripted kiss to the director's irritation.
Sayu Yagami is a devoted fan of Hideki Ryuga, following his TV program so closely that she objects when Light moves to switch it off.
Looking for more on Hideki Ryuga? The Death Note Wiki on Fandom has a dedicated page with community notes.
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