Classification: Dark elf-human hybrid, wizard
Threat level: Demon
Age: 100+ years
Physical strength: Large building+ striking
Destructive capacity: Mountain+ (Raijin-Ken is a mountain buster), at least country with Halloween (slightly more than half as powerful as Black Sabbath which early series performed an at least country+ level feat)
Durability: Likely mountain
Speed: At least supersonic+
Intelligence: High, one of Dark Schneider's Riders of Havoc. Master warrior trained by DS since her infancy in the arts of magic.
Stamina: High. Far above average humans.
Range: Few Dozens of meters to kilometers || Unknown
Weakness: Overpossesive nature to DS || Unknown
Standard equipment: Raijin-Ken (Lightning god sword)
Noteworthy Attacks and Techniques
Def Leppard: creates an opening to another dimension absorb all magical energy, rendering the use of spells and magic based attacks impossible.
Anselm: A spell creating light arrows homing on the target's vital spots. It easily bypasses regular armors.
Ryott: A 2 million volt lightning discharge created from the user's palm.
Dee N' Tear: Summons a tornado restraining the target and cutting it to shreds with high-pressure wind blades.
Sword of the King, Claws of the Eagle: Nei's signature sword strike, it's on par with Gara's Shin Majiken and can easily destroy a building.
Exodus: The spell caster gets surrounded by 20000° flames from the deepest circle of Hell and then use his own body as a weapon by throwing himself towards the target. The heat is so intense it can vaporize stone.
Megadeath: A spell using the opposing forces of air and earth to create a gigantic explosion able to take down large fortresses. It also creates a thunderstorm and an earthquake.
Tesla: The most powerful lightning spell creating a gigantic electric blast falling on the target and obliterating it. When mastered it's easily a hundred meters in width.
Lightning Comet: Nei's most powerful sword strike, it's an attack striking from the air that is said to be as powerful as Tesla.
Halloween: A huge blast of energy shot from the user's palm. The target is submitted to an energy of 10MeV. It can only be used during certain moon phases and lasts for a few seconds but it can easily destroy an army of many millions (though this rule is mostly thrown out the window later on in the story).