Ichi Tanaka attends Yurigaoka Girls Academy as a first-year student and serves as Class President for the Tsubaki class. She is a courageous member of Legion Álfheimr's second generation, known for setting high standards for herself and others, and demonstrating a strong commitment to those expectations. Her significant relationships include a deep care for her roommate, Kusumi Egawa, and a friendship with Masaki Takahata from Alchemilla.

Physically, Ichi has green hair and purple eyes. She stands 161 centimeters tall and weighs 48 kilograms. Her birthday is November 3rd, and her blood type is B. Her surname "Tanaka" translates to "dweller in the rice fields," combining "ta" (field, rice paddy) and "naka" (middle). Her given name "Ichi" means "I" or "one."