The people that we’ve seen who carry Kekkei Genkai mostly have a single attribute, but Mei Terumi is different. He has two types of attributes—lava style and boil style. He’s already powerful from this point alone in Naruto game.
Exactly how powerful is she? She taught the Fourth Hokage sealing jutsu. She uses the Kekkei Genkai to seal the chains of Nine Tails. Among the past Jinchurikis, she’s the only one who suppress Nine Tails with her own chakras.
We’re all familiar with Tsunade’s strength. Her fight with Madara Uchiha in the Fourth Great War is memorable.
We know she must be powerful just from the Uzumaki name alone. The first jinchuriki of Nine Tails can make the chakras of Nine Tails mesh perfectly as well as activate a similar Nine Tails Mode as Naruto’s.
The final boss, the first person to possess chakras in the Naruto universe. He also possesses the White Eye, the Rinnegan, and the Sharingan. He is the creator of the world of Ninjas!
A character that appeared in the theater version, the daughter of Naruto and Hinata, and inheritor of her mom’s Kekkei Genkai and the White Eye technique. Knocks out Naruto when she was only 6 years old and gives Naruto a coma. Note that Naruto was already the Seventh Hokage and already immensely powerful. The fact that Himawari could give Naruto a coma is terrifying.