Kiki Benjamin is the fourth member of the central team to be discovered and is notably the youngest of the group. Her background is marked by significant responsibility; after the death of her mother when Kiki was very young, she took on the role of caretaker for her five younger siblings. With her father, a master of various fighting styles, frequently absent while training in the mountains, Kiki manages both the household and the family finances despite her young age. To support her family, she previously worked as a street performer in the park, a job that showcased her natural acrobatic talents.

In terms of personality, Kiki is the most hyperactive and energetic member of the team. She is full of life, loves having fun, and approaches most situations with a playful and mischievous spirit. Her behavior is so aligned with her abilities that the other team members agree her animal DNA is a perfect match for her character. While her older teammate often finds her behavior very immature, her boundless energy and love for performance are seen as core parts of who she is. She often refers to the other Mew Mews with an honorific that signifies she views them as her older sisters, highlighting her desire for family and connection.

Kiki’s primary motivation stems from her sense of duty to her family and her desire to protect others. She deeply misses her mother and tends to avoid the subject when it is brought up. Despite the heavy burdens she carries at home, she maintains a sweet and childish demeanor, showing a remarkable resilience to stress and responsibility. Her role within the story is that of the youthful, agile fighter who often brings a lighter perspective to serious situations, though her resolve becomes evident when her loved ones are threatened.

Key relationships define much of her character arc. She shares a close bond with her five siblings, which include one sister and four brothers. A particularly significant relationship develops midway through the series when she is captured by an alien enemy. Instead of fearing him, she befriends him, giving him an affectionate nickname. Their unique friendship grows throughout the story, leading to moments where she is reluctant to fight him, and she expresses deep sorrow when he is seemingly defeated. This relationship demonstrates her ability to see past surface-level conflicts and connect with others on a personal level.

As the story progresses, Kiki shows development from simply being the hyperactive youngest member to a more nuanced character who grapples with complex emotions like love and loss. Her initial naivety is challenged as she faces difficult choices during the final battles, though she retains her core compassionate nature.

Kiki’s notable abilities are derived from her infusion with the DNA of a Golden Lion Tamarin, a type of monkey. This grants her superhuman agility and acrobatic prowess, which she uses effectively in combat. When transformed, she grows monkey ears and a tail, and her appearance changes to include bright blonde hair and a yellow jumpsuit. Her primary weapon is a pair of rings, which in one adaptation becomes a golden tambourine. Her signature attack involves a series of flips and somersaults before unleashing a blast of yellow energy that encases her enemy in a jelly-like substance. Her element is associated with earth, and in a moment of high stress, she demonstrated the ability to create a giant wall of stone to protect her friends.