Sun God Princess

Celestial Sun Maiden (太陽の神姫) was princess from the New World.

Background
The Celestial Sun Maiden was born over two hundred years ago in the New World. Three years after Keno Fasris Invern and Suzuki Satoru journeyed together, the pair encountered the Celestial Sun Maiden. Keno asked her a question regarding the cancellation of the zombiefication curse, however she received no satisfactory answer.

The Vampire Princess of the Lost Country Arc
While Suzuki and Keno interrogated Kunivela, the Celestial Sun Maiden was mentioned by the former.

Abilities and Powers
Given how Keno asked her on a way to dispel zombiefication of Inveria, it can be assumed the Celestial Sun Maiden has some knowledge in magic.

Trivia

 * Based on her name title in Japanese, it can be assumed she is a princess.