Jahy

Jahy (ジャヒー) is the former No. 2 of the Dark Realm and the titular protagonist of The Great Jahy Will Not Be Defeated!.

After losing most of her demonic powers to a Magical Girl, Jahy now resides in the human realm in the body of a young child while she works to collect enough mana crystals to return her former realm to normality.

After
Jahy's "after" form is that of a child, so she takes the appearance of a short young girl with tanned skin and inwards-slanting red eyes with yellow pupils. Her hair is a deep purple and reaches down past her knees, usually worn in a thick braid with two loose shoulder-length clumps framing her face and an set of uneven bangs that fall over her eyes. She also has two horn-like tufts of hair protruding from either side of her head, and noticeably pointed fangs and ears.

In this form, Jahy wears nothing but an oversized white shirt with "The Dark Realm's Reconstruction" vertically emblazoned on it in black, as well as a necklace on which she keeps her amber-colored mana crystal.

Before
Before losing her powers, Jahy essentially took the form of an adult version of her "after" self, although there are some notable differences; in this form, Jahy's eyes were yellow and cat-like rather than red, and her ears were significantly less elf-like and pointed.

Her demonic attire consisted of a short pair of navy blue shorts with two gold-pointed straps extending from their center, which wrapped around the back of her body before winding back to her chest, where they were then fastened over her breasts by a golden loop which was held in place by a matching gold-tipped choked around her neck. A red magic stone was held at her neck by the ends of her choker, and she also sometimes sported thigh-high boots of the same navy color as her outfit, though often went barefoot.

Personality
In nature, Jahy is a prideful and arrogant being who believes she stands much higher than everyone else, the only exception to this being her one superior, the demon lord Mao. She views humans and even demons who are lower than her as unworthy of even being spoken to, and she'll often act rudely towards them as a result even if she's the one who initiated the conversation.

However, when a human praises her or treats her well despite her haughtiness, she'll often abandon this attitude and become flustered, asking herself why they don't fear her and becoming unable to properly respond with her usual level of confidence. She'll also drop her normal attitude when humans, such as her child friend Kokoro, treat her with respect and admiration, and will begin to respect them back and acknowledge them more since she believes they understand her.

Jahy also seems to be insecure about how little she's achieved in the human world, and will often have to cheer herself on or be motivated by others to avoid being discouraged. This is especially prominent during her interactions with Druj, her former underling, who has managed to be successful even after losing all of her demonic powers and having to start over just like Jahy did. She seems to have trouble consistently believing that she's absolutely better than everyone else even though that mindset never wavered during her time in the Dark Realm, and, perhaps as a result of this, she has become a little more accepting of those around her.

Due to her time spent struggling in the human realm, Jahy is also capable of feeling sympathy for others who have endured similar hardships. She feels for Kyoko Jingu when she tells her her story of misfortune, and even offers to save her, albeit at the cost of the gems Kyoko possessed.

Abilities
As the former No. 2 of the Dark Realm, Jahy has been stated to have been powerful individual who had many supernatural abilities at her disposal. Due to the destruction of her home realm and her lack of mana crystals to use as a power source, however, she currently can't access the vast majority of the abilities she claimed to have had back when she was the No. 2, only a limited and weaker amount.
 * Transformation: Jahy was transformed into a child upon leaving the Dark Realm, but is still able to revert to her initial form for a limited period of time each day as long as she is in possession of a mana crystal. The duration of time for which she's able to transform is dictated by the size and power of the gem she's using. Back before the realm's deconstruction, she was also able to grow a pair of wings.
 * Matter Manipulation: Via the use of a mana crystal, Jahy is able to remove particles such as dirt and grime and quell stenches without physically moving. She can also cause thunderstorms, and manipulate some form of gem-like matter to use as projectiles.
 * Resurrection: Via the use of a number of more powerful mana crystals, Jahy claimed she would be able to restore the Dark Realm to its former glory by herself, and that she'd also be able to revive the demon lord.

Trivia

 * Jahy's name appears to be a shortened form of the Japanese word "jashin", which can either mean "evil god" or "wicked heart" depending on its reading.
 * Jahy's design was likely based on that of Safi, a character from Wakame Konbu's previous manga, Dreaming Prima Girl!, as the two share a number of physical similarities.

Quotes

 * (To Kyoko Jingu) "You are gravely mistaken! You think you carry the burden of misfortune alone? Fool! I lost everything because you destroyed the Dark Realm! I've had to suffer endless hardships up until now, and because of you I've experienced great adversity! But... Nevertheless... I refuse to let you carry this burden of misfortune on your own!"