Akazukin hails from Phandavale's magic world, serving as one of the Three Fairy Musketeers sworn to protect Souta Suzukaze, the "Key of Erde," from the witch Cendrillon. Eleven years before the main story, werewolves commanded by Jed attacked her home, Vise village. Jed sought his younger brother Cain, and the assault claimed Akazukin's parents and Cain's mother. Amidst the ruins, Akazukin discovered Cain transformed into a wolf; he became her steadfast companion, Val.

In combat, Akazukin favors physical strikes amplified by fire magic, differing from Shirayukihime's ice and Ibara's earth abilities. Her power surges when the Musketeers gain "ultimate magic," unlocking her "Princess Mode." This temporary transformation grants her a princess-like appearance and enhances her signature card-based magic.

Her bond with Val, rooted in shared tragedy and mutual defense, defines her deeply. Val is Cain, cursed into wolf form and unable to revert fully due to injuries from Jed's attack. Akazukin also develops feelings for Souta, fueling her resolve to shield him and creating minor friction with Souta’s childhood friend, Ringo, over his safety and affections.

Throughout her journey, Akazukin confronts the pain of her past while battling Cendrillon's forces. Her resolve hardens as she uncovers truths about Vise's fall and Val's heritage. Following Cendrillon's defeat, Akazukin and other Phandavale residents return to their world, leaving Souta in Erde. Despite the separation, she clings to hope for a future reunion.

Akazukin occasionally uses verbal tics like "Zukyun" and enjoys Erde's cuisine, often sharing meals with Val. Her design consistently features red attire, reflecting her "Little Red Riding Hood" inspiration across all adaptations.