Arshes Nei is 115 years old and has the appearance of a very beautiful woman with dark skin and hair, long pointed ears, and a large bosom. She is often wearing revealing clothing.
In battle, Arshes is fierce, stern, and merciless, with a take no prisoners attitude. Once an opponent begins to fight her, they must either win or die at her hand.
She is passionately in love with Dark Schneider, both as a lover and a father figure.
Arshes Nei was born around 100 years prior to the events of the Bastard!! manga. As a Human/Dark Elf hybrid, she was already an outcast at her birth, as both societies were reluctant to accept her. The Dark Elf clan she lived with belittled her and jumped at the first opportunity to abandon her when conflict broke out between her clan and the Wood Elves.
A child on her own, Arshes Nei came upon Dark Schneider, grabbing at his cape. Feeling a rare sense of pity, the wizard took her in, raising her as his own daughter. This facet is more fully explained in Volume 11. It was revealed that Nei was her given name and meant "no" or "not true." Dark Schneider subsequently gave her the name Arshes and he is the only one allowed to address her as such. When she came of age, she became his lover as well. In his conquest of the world, Arshes was one of his chief commanders, the first of the Riders of Havoc to join him.
Arshes Nei is still one of the Four Riders of Havoc as the current timeline begins. Her own chief underlings are Sean Hari, Kai Harn, and the Vampire Dai Amon. She granted the first two their power. After Ninja Master Gara betrays the Riders of Havoc and rejoins the resurrected Dark Schneider, Nei is assigned to defeat him by Dark Priest Abigail and Ice Lord Kall-Su. When her underlings fail, she is left to take him on herself, but only after Abigail ensures her loyalty with the Curse of the Accused, in order to prevent her betrayal, as he knew that Arshes was by far the closest to Dark Schneider out of all of the Riders of Havoc in the past.
Her subsequent fight with Dark Schneider is an intense affair, with Metallicana suffering as a side effect of their battle. Arshes Nei's feelings for Dark Schneider begin to resurface. She wishes for Dark Schneider to kill her in a duel with Halloween so she won't suffer Accused's effects: being turned into a toad. However at the last moment before the curse takes hold, Dark Schneider rips his own heart out and sprinkles Arshes with his blood, breaking Accused.
At that point, Arshes rejoins him to prevent the awakening of Anthrax. She fights with him against Abigail, and then joins him and the other riders on the Arc after Anthrax's awakening and the subsequent invasion of the Angels of Heaven after the two year time skip.
After the four-year time skip between volumes 19 and 20, her exploits are relatively unknown. She did make a brief appearance in volume 24 along with Kall-Su.
Enhanced Strength: Arshes Nei is strong enough to deliver blows capable of shattering stone and crush human bodies.
Magic: As a magician, Arshes Nei is formidable. She is a master of air elemental magic, specializing in spells involving lightning. So much so that she is known as the "Thunder Empress." She is said to be nearly as powerful as Dark Schneider, and given the fact that she fought well against him this is sustained. Via her empowerment of Sean Ari and Kai Harn, it is implied that she is skilled in High Ancient and Charm magic as well. She is also familiar with Fire Magic, though she does not specialize in it as Dark Schneider does.
- Iron Lightning Anthem: Creates magic arrows of energy that will always hit their target unless a powerful barrier is up to shield the enemy.
- Megadeth: Spell that creates an explosion of magic, like a bomb.
- Def Leppard's Black Liquid Lightning Sphere: Create a lightning ball that is a bottomless portal to another dimension and absorbs all magical energy.
- Raven: A high mobility flight spell.
- Exodus: Envelopes the user in fire, and hurls them at the target.
- Riot: Several arcs of electricity attack the target.
- Gilbert: A spell that summons a group of lightning elementals to attack the target.
- Wolfgang: Sends a powerfull wave of wind and electricity.
- Helloween: The user opens the gates to hell and releases a powerful blast of limitless energy from his/her palm.
Swordsmanship: Arshes Nei is also an adept swordsman, and her skill exceeds Dark Schneider's in that area. Her blade, the Raijin-Ken, the Lightning God Sword inhabited by the Nue elemental is able to cut through mountains and even regenerate after it has been broken. She was seen easily destroying buildings with her sword.
Arshes' story is rather identical in the anime as in the manga, though she only engages in one fight with Dark Schneider instead of two, and fights with Abigail only, not the highest three undead that he unleashes in the manga.
- Gara vs Arshes Nei (Chapter 29 - Chapter 30) - Interupted
- Dark Schneider vs Arshes Nei (Chapter 34 - Chapter 40) Dark Schneider gave up
- Gara, Arshes Nei, Dark Schneider vs Lynch (Chapter 43-Chapter 44)- Won
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Arshes Nei is a playable character in the Bastard!! - Ankoku no Hakai-shin video game for the Super Nintendo Entertainment System and the Bastard!! M.U.G.E.N. game.