Kurodonna

Kurodonna is the fusion of Kuroninja, Yodonna, and Reversian Succubus Hells. The two of them share one body, but Kuroninja and Yodonna are in the mind of that body. Yodonna is the main controller of Kurodonna.

History
During a fight between Kuroninja and the Anti 7, Yodonna obtained a mysterious shuriken-shaped device from Anti-Kuroninja. She used it on Kuroninja, but then they got fused together. Kuroninja decided to name this fusion "Kurodonna" after realizing what was happening. The two of them then decided to work together to try and enter the Shadow Dimension.