Yume

Yume is a mysterious being who looms ominously as one of the most serious threats to yet be unaccounted-for.

History
Revealed to be the creator of The Shima Brothers, after Mushima's death, Hishima and Takashima succeeded in unsealing Yume from her self-imposed stasis within a hidden Royal Tree. Clad in nothing at all, she emerged and proceeded to backhand Hishima with savage force - Admonishing her creations for being "7,200 hours later than planned."

Though F-Klak seemed to show some interest in her, Yume's present whereabouts are unknown. For the time being, she seems to be waiting for an unknown opportunity to reveal herself.

Abilities & Powers
Despite her small size and slender build, a single backhand shortly after emerging from uncountable years of stasis was able to send a largely-mechanical being the size of Hishima flying through the air.
 * Great Strength

Yume has displayed great speed, very nearly catching Hishima with a surprise hit - Hishima being the apparent fastest of his brothers.
 * Great Agility

Though not shown in great detail, Yume seems to at the very least have surety while handling a sword of high calibre.
 * Swordsmanship

It has been all but confirmed that every single piece of technology used to harness The Arboretum Notes and the Royal Tree was built by Yume herself.
 * Genius Intellect

Trivia

 * Yume's name means "dreaming" in Japanese.