Kimiko Kujo

K whose real name is Kimiko Kujo is one of the letters of Wammy's House.

Kimiko Kujo is Kimihiko Nikaido's assistant scientist. When she was inside the lab with Kimihiko Nikaido. They discovered a virus weapon from Thailand and the U.S. government wants them to examine it, but Kimihiko examine it already. He showed her the video from the Americans that there're recorded from the thai village, that the Thai people got a deadly virus.

When L send a message to her about Watari has pass away, it shocked her, and she will mourn his death, too.

When Kimihiko tell her to meet him in the lab, and she called Daisuke Matoba, a bioterrorist leader and his terrorist group, to go to the lab and meet her there. She betrayed him and they want the antidote, but Kimhiko destroyed it and committed suicide with the deadly virus. She was shocked, when Kimhiko died by the virus.

She went down a dark path and became part of a bioterrorist organization which plans to "cleanse" the world of its excess population by a deadly virus. She is one of the letters who went evil much like Beyond Birthday. However, unlike Beyond, Kimiko is turned back to the right path by L, as one of his last acts. She was arrested by the Japanese police along with them.

She is not in the anime or manga she is only in the film L: Change the WorLd.