Mako Shirakabe is a 17-year-old member of the Tōkai region's manzai comedy group Celebri-Tea (セレブリ茶). She possesses distinct lilac hair and matching lilac eyes, typically styled to her shoulders and adorned with a hairbow, and stands 159 cm tall, born on August 10. Mako actively presents herself as the daughter of a wealthy corporate president, yet this image clashes with observable behaviors like displays of greed and a conspicuous eye for luxury. Her actual background is that of a commoner. Through their shared comedy pursuits, she forged friendships with her Celebri-Tea teammates, Saeka Yabukita and Hikari Jogasaki, and strives to match the group's dynamics to fit in.

Rumors circulate that Mako secretly holds part-time jobs, though the specifics of these activities and her motivations remain undefined. Her interactions consistently focus on maintaining her place within Celebri-Tea while navigating the contradictions between her claimed identity and her true circumstances. Her potential character growth concerning her background, relationships, or role within the group is not depicted in the documented media.