Lime is a marionette created by Starface, the elder prince of Romana, as a gift for his younger brother, Junior. Her construction was completed just moments before Starface was arrested for treason and conspiracy against the king, making her the newest and youngest addition to the royal Saber unit. She is a childlike android equipped with an otome kairo, a special circuit that grants her genuine emotions and a will of her own.

Lime possesses an extremely sunny, naive, and pure-hearted personality. She is lively and spontaneous, often acting on impulse without fully thinking through the consequences. Her emotional state can shift rapidly, and she struggles to control her feelings when they run high. She has a natural tendency to cling to Junior, showing deep affection and an eagerness to please him. Her innocence makes her easily hurt, but she never holds a grudge for long.

Her primary motivation is to protect Junior and earn his love and approval. She wants to be useful to him and to the royal family, and she seeks to understand the world around her with wide-eyed curiosity. As the story progresses, she learns to channel her raw emotions into more disciplined combat under Bloodberry's guidance.

In the narrative of Saber Marionette R, Lime serves as one of Junior's three Saber marionettes, accompanying him in the city-state of Romana. She participates in the Battle Saber Tournament, where she demonstrates her immense physical power. During the tournament, she is buried deep in the arena floor by the reigning champion Lun, yet emerges without a scratch and then replicates Lun's own finishing move to obliterate her opponent entirely. This incident showcases her extraordinary resilience and strength, as well as her ability to learn and adapt.

Lime shares a sisterly bond with Cherry, the more reserved and domestic marionette. Cherry often grows frustrated when Lime interrupts her private moments with Junior, but she genuinely cares for Lime and looks out for her. Lime also looks up to Bloodberry, admiring the older marionette's combat prowess, though she initially feels intimidated by her. After three days of intense training under Bloodberry, Lime's raw potential becomes evident, and she eventually beats Bloodberry in a mock battle. This training helps Lime gain better emotional control in combat.

When Junior's life is in serious danger, Lime enters a berserk overdrive state. She unleashes an enormous amount of energy, making her nearly unstoppable, but this mode rapidly depletes her battery, leaving her incapacitated after a few minutes. This state first manifests when the sadistic Sexadoll Edge captures and tortures Junior. Lime's fury during that event establishes a fearful rivalry with Edge.

Notable abilities include superhuman strength, speed, and endurance far beyond that of ordinary marionettes. Her greatest asset is her raw power, but her lack of focus initially hampers her effectiveness. Through training, she learns to control her strength more precisely. Her berserk mode is her ultimate trump card, capable of overwhelming even powerful opponents, but it carries a severe energy-drain drawback. She is also highly resilient, able to withstand attacks that would destroy other marionettes. Her agility and quick learning allow her to mimic opponents' techniques after seeing them just once.