Sakura Hagiwara, also known as Transcendent Cutie and Fighting Princess is the main protagonist for the Wanna be the Strongest in the World! series. She is the co-lead vocalist for Sweet Diva and a professional wrestler for Berserk Gym.

Sakura is a petite, young girl with outstanding bodily features. She has long, silky black hair with a navy blue tint to it, sparkling hazel eyes, a voluptuous body with thick, durable thighs, a round butt and big, squishy boobs.

As a pop idol, Sakura would wear long white gloves, a red and white top over a red and gold shirt, a pink and white skirt, black stockings and white boots.

When Sakura decided to become a pro wrestler, she wears the Berserk attire while training and uses white and red armbands and a two piece that let her boobs hang out, allowing them to jiggle at times during wrestling matches. After her fight with Rio when she loses in the Masacara conta Masacara (hair for hair) fight, her hair gets cut short to a choppy, tomboy length, but starts to grow back as seen in episode 8.

Sakura is a perky, naïve, and emotional girl, as seen throughout the story in many episodes. But she's confident in what she does as a vocalist and pro wrestler.

As the series progresses, Sakura becomes more serious in fighting and starts to take on more challenging opponents, showing the growth she has gone through. Moreover, she also wants to help other fighters to get better, as seen with Moe Fukuoa.

Sakura is also seen to be a pushover every once in a while during matches, often begging her opponents to stop harming her when she's in pain. Most times when she fights, and is losing, Sakura can be seen with watery eyes and pink cheeks, often because she is in a revealing position that exposes her bust, butt or thighs.