Luka Urushibara

Luka Urushibara (漆原るか, Urushibara Luka), named Ruka Urushibara in different translations of certain media, is a supporting character in Steins;Gate and Steins;Gate 0.

He is the "apprentice" of Hououin Kyoma, who nicknames him Lukako (or Rukako), and works at the Yanabayashi Shrine owned by his family. He was eventually added into the Future Gadget Lab as Lab Mem 006.

Appearance
Luka is a frail boy, with a effeminate appearance. He usually wears the Miko Priestess outfit, in place of his sister, at the request of his father. When he is not wearing Miko's outfit, he is dressed in jeans and a black T-shirt.

Personality
Luka is very sensitive and emotional. Even simple, sudden responses from Rintaro can cause him to cry or tremble. He likes to wear girly clothing, which caused Kurisu to confuse him for a real girl when the two met in Rintaro's lab. Rintaro describes him as "More girly than any girl, more feminine than any female." in the game.

Luka harbors deep feelings for Rintaro ever since their first encounter in Akihabara, when he was still a male. However, Luka felt that his feelings were taboo and kept them hidden. Later in the story, as Rintaro attempts to save Mayuri by reversing the effects of the previously sent D-mails, the female Luka tearfully agreed to allow her D-mail to be undone under the condition of Rintaro taking her out on a date. The date played out awkwardly, since Rintaro was unable to be himself around her. He later visited her at the shrine and apologized for botching the date, and the two embraced. Luka said she would still love him even if she was no longer female.

Trivia

 * Due to the uncertain nature of the romanization of Luka's name prior to Steins;Gate's official english release, many fantranslations of the series' different entries and spinoffs use the romanization "Ruka" instead. This was unintentionally reinforced due to the anime's official english subtitles and subsequent english dubbing, which use the "Ruka" variants.
 * For official english versions of Steins;Gate's game releases, however, the use of the "Luka" romanization is reinforced by the Japanese staff, and thus is considered the correct and canon use.
 * Luka frequently confuses the words "Kongroo" and "Kongaloo".