Yumi Nakatsuka

Yumi Nakatsuka is the Zodiac Yellow Ranger in Power Rangers: Rebirth. She is a karate champion and former student at the Wind Ninja Academy and trained under the tutelage of the now dead Tori Hanson. She greatly admired Tori and thought of her as an older sister, she also had admiration for Shane's humility and believed that Dustin was a wisecracker, but great teacher. She is Japanese-American and the team's heavy muscle. Yumi is also a tough, no-nonsense warrior, but a good hearted person.

Biography
Yumi Nakatsuka was born in Blue Bay Harbor in 1995. Her father was once a student at the Wind Ninja Academy and taught his daughter the way of the ninja. When she was 12, Yumi and her parents moved to Tokyo and there she graduated from junior high and high school at the age of 16. After high school graduation, Yumi returned to Blue Bay Harbor and then enrolled in the Wind Ninja Academy when she was 17.

There, Yumi trained under the guidance of Wind Blue Ranger, Tori. Tori, Shane and Dustin saw great potential within her and she trained in all three elements. Yumi admired Tori and looked up to her like a sister and thought of Shane as humble, and Dustin although a great teacher, he was more like a comedian. The day she graduated from the Wind Ninja Academy, the war was imminent and many students and ninja masters were killed. Yumi was completely devastated when Tori was killed by Deathowl as well as Shane, Dustin, Cam, Hunter and Blake. Since then, Yumi trained hard and vowed revenge on Deathowl and never forgive him for the deaths of her fellow students including the Ninja Storm rangers.

Shortly after the war, Yumi became a martial artist participating in many competitions. She became a karate champion five years later on her way to the Olympics. While on the beach, Yumi trained thinking about how strong she has become and thankful to Tori and the others for their guidance, that is until she was attacked by remnants of Malastarians. She fought them, but was later outnumbered and in grave danger. Suddenly, a yellow energy decimated Yumi's assailants and then took the form of a serpent, it was Ophiuchus.

Ophiuchus then warned Yumi of the impending return of Fyrus and his army, and recruited her to become Earth's new champion along with the other four. Yumi became the Yellow Zodiac Ranger, and with her newfound powers she vowed revenge against Deathowl, Fyrus and Onox. But first she had to locate the other rangers in Angel Grove.