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The former jinchūriki and Saiken.
Kiri is the was the jinchūriki of Saiken — the Six-Tails. She's capable of using the Six-Tails' chakra in various and different levels, and is able to control the power up to the sixth tail. In the past, the Six-Tails has already manifested while protecting his vessel from any harm; but because of his power, she swore to never use it again.
Initial Jinchūriki Form[]
By using the Six-Tails' chakra, Kiri is capable of releasing its power and as such, turn the tide of battle in favour. Like Utakata, Kiri's eyes turn yellow while displaying this power, but she doesn't have any other changes like Naruto. With this, her physical power and chakra increase considerably making it possible for her to free herself from any control.
Version 1[]

Kiri in her Version 1 form.
By releasing more of the Six-Tails' chakra, Kiri can create a chakra cloak. With it, she can absorb and nullify powerful ninjutsu capable of easily destroying a village.
Version 2[]

Kiri in her version 2 state.
After finishing her training, Kiri displayed the ability to enter a "Version 2" form, by moulding the Six-Tails' chakra into a human-like shape around herself. When entering into this form, the sudden increase in chakra was such that it instantly vaporised Kiyoko's water clone.
In addition to forming a dark chakra cloak around his entire body, his appearance becomes more rounded, like that of the Six-Tails; while her hair still is noticeable long, like her regular appearance. With the power granted by this form, Kiri not only manifests all of her beast's six tails, but also becomes able to ooze a highly corrosive, alkaline substance that seemingly makes it more difficult to trap or compress her.
Partial Transformation[]

Like Utakata, Kiri is able to go into a partial transformation.
althuogh it is unknown how much control Kiri had over the Six-Tails after her training, she was able to form one of the beast's tails without the use of a chakra cloak.
Full Six-Tails Form[]

Kiri's full Six-Tails Form.
During her childhood, Kiri gaave into the Six-Tails infulance and transformed into her full Six-Tails form. In this form, he takes on the appearance of the Six-Tails itself, allowing him to manipulate the full extent of the beast's considerable powers, including its ability to expel a gas that corrodes whatever it comes into direct contact with. Like most other jinchūriki who have obtained their respective full tailed beast form, Kiri is also able to use the Tailed Beast Ball.