漆原るか, Lukako, Ruka, Rukako, Ruka-meow, Lab Member 006, Warrior
Birthday:Aug 30, 1993
Height: 161 cm 53 Second year in Kasensou Private Prepatory Academy. Mayuris classmate. Luka has the personality of a polite wellgroomed and justified kind of person. Uses honorifics specifically with Rintarou. Luka doesnt push their opinions much upon others but when they do they become quite bashful and blush quite a bit. Because theyre quite serious by nature they simply believe what others say. Thanks to that Luka thinks all the ridiculous stuff Rintarou talks about is real. Rintarou makes them out to be his student on their own and is currently in the middle of brainwashing them. A very shy person Luka often turns down Mayuris requests to cosplay.