|Voice Actor||Dawn M. Bennett|
Niina is young teenage girl of average height and has long brown hair and brown eyes. She is seen wearing her school uniform though she leaves the top button undone to reveal a black blouse underneath.
She prefers to play fighting games but due to this, she becomes distant and reclusive from her clubmates.
However, she appears to be kind as she gave Keita Amano a souvenir from the club after he was asked to join by the other members.
According to Karen Tendō, Niina plays games due to trying to get her friend back from the "dark side". It is unknown what this statement really means but the only thing shown is that Niina plays games, so much that she barely associates with others.