Tokui Sora was born on December 26, 1989 in Minamibousou City, Chiba Prefecture, Japan. She has a younger brother. She graduated from Dwango Creative School, a voice-acting/vocalist training school operated by MAGES. Inc. She's a huge fan of Neon Genesis Evangelion and, in particular, the character Asuka Langley Soryu which she has cosplayed in multiple occasions. She credits Miyamura Yuuko, the voice actress for Asuka, as the inspiration for her to become a voice actress. In April 2012, she was appointed as the tourism ambassador for her hometown. Her favorite foods include Pepsi Nex, white rice, salmon, and meat. Her disliked foods include boiled eggs, tofu and tomato juice.