Lemon Ando is a supporting character in the anime and manga series Tune In to the Midnight Heart. She is a teacher at Furin High School and serves as the adviser of the school's Broadcasting Club. She is twenty-seven years old. She has a tall build with short black hair cut in a bowl style and black eyes. Her typical attire consists of a mustard-colored turtleneck sweater tucked into a black pencil skirt, paired with light brown stockings and brown boots. Her expression is often described as bored or uncaring.

Lemon Ando carries herself with an apathetic and aloof demeanor. She is blunt and rough in her interactions, frequently using sarcasm and snarky remarks, and she tends to keep people at a distance, including her students. She does not pretend to be invested in her responsibilities as an adviser and often allows the Broadcasting Club members to act without much oversight. This has led to her being regarded as a jaded and detached figure within the school. Despite this outward indifference, there are moments where she quietly supports her students when they truly need it, suggesting a hidden layer of care beneath her cynical exterior.

Her role in the story is primarily that of a faculty supervisor for the Broadcasting Club. She provides minimal guidance and is largely hands-off, which gives the main characters freedom to pursue their goals. The club members affectionately call her Lemon-chan. Her motivations are not deeply explored, but her disengagement appears to stem from a general lack of enthusiasm for her job or a sense of disillusionment. As the narrative progresses, she may show subtle development in her level of involvement with the club, though her core personality remains consistent. She does not possess any special abilities; her presence is defined by her attitude and her position as an authority figure who chooses not to exert authority.