Su

Su (スー) is the false antagonist of The Great Jahy Will Not Be Defeated!. She is the mysterious being of light responsible for turning Kyoko Jingu into a magical girl, and taking all of the Mana Crystals from the demons.

Appearance
Su takes a similar appearance to her sister the Dark Lord: she's a girl of short stature with long, wavy hair parted down the middle, and two horns protruding from each side of her head. However, her complexion, hair and clothes are lighter than the Dark Lord's, and she wears a layered magical girl dress rather than a one-piece, though she also goes barefoot.

Personality
Su seeks attention from her reclusive big sister, enough to send a Magical Girl (Kyoko) to attack the Dark Realm. The Dark Realm's destruction, scattering of her sister's mana crystals, and subsequent fallout of misfortune in the Human Realm is all accidental. By manipulating Kyoko to collect the magical crystals, she tries to fix her mistake, save the Human Realm, and reconcile with her sister.

She gets frustrated when things don't go her way. After the Boss refuses to take Jahy and Kyoko's crystals by force, and then scolds Su for 'doing bad things', Su is upset enough that she attacks the trio.

Su appears not to want anyone to get hurt, but gets carried away fighting her sister, almost destroying the town in the process. She stops fighting when Jahy is knocked unconscious by jumping between the sisters.

Still upset that things never work out how she wants, she breaks down and explains her actions. She only apologizes when Jahy demands she do so.

Abilities
Su is the being responsible for turning people into magical girls. She is also able to stand toe-to-toe with the Dark Lord in battle.
 * Magical Girl Creation: Su was able to turn at least two humans, Kyoko Jingu and the Boss, into magical girls, granting them different magical powers. Kyoko gained destructive capabilities and the Boss gained the power to produce flowers. She also turned a demon, Saurva, into a magical girl, and granted her a katana with the ability, according to Jahy, to tickle and fix stuff shoulders, however the transformation was reverted after she fled from Jahy.
 * Transformation: Su herself is able to transform into a larger, ghostly form of herself that can levitate and glows a bright white. She can also increase her size, growing to twice the size of the buildings around the izakaya.
 * Beam: While in her increased size form, she's able to let off a destructive beam from her mouth, strong enough to dent the front of the izakaya's sign despite Jahy's attempt to weaken its force.