Pink is a small, pink chameleon with dark pink scales tracing his spine and vibrant green eyes. A distinctive purple stone affixed to his tail grants him speech through its connection to his owner, the idol singer My Sunshine, also called Suiren.

His personality features frequent complaining, often directed at Suiren's choices, masking genuine concern for her well-being. He persistently desires to eat Aibou, Bashin’s pet mouse, revealing a mischievous streak. As My Sunshine’s pet, Pink serves as both companion and reluctant caretaker, attempting to steer her toward a conventional idol image while supporting her secret passion for Battle Spirits card battling.

Pink recruits Bashin and allies when a curse from music instructor Amade Us transforms Suiren into a rapper and brainwashes others. He devises a plan to break the curse by challenging Amade Us in a rap battle, performing alongside other pets to restore My Sunshine's true personality. Later, during the King Uchuuchouten Cup, Pink infiltrates the control room with other pets and allies J and Hayami to disrupt Number Nine’s scheme.

In the climax of Bashin’s battle against King Uchuuchouten, where the stones of chosen card battlers serve as life counters, Pink’s stone is destroyed. This reverts him to a non-speaking, ordinary chameleon. His final words emphasize Suiren’s growth, urging her to remember she now has friends and is no longer alone. The series epilogue implies restoration of the stones, suggesting potential recovery of Pink’s speech and abilities.