ルフィル・グラキス
from The Magic in this Other World is Too Far Behind! (Manga)
Lefille Grakis is the maiden of the Sanctuary of Nosias and the only living member of the royal family. She has the power of the spirits in her body and is a swords woman. She helps Suimei on his journey to find a way back to his world. She is a former citizen of Nosias. She housed the Power of the Spirits. Her home and family were destroyed by the Demon Invasion. Lefille is a young woman, slightly older than Suimei. She had deep crimson hair and a gallant figure. Both her features and clothing in her normal form were elegant. She usually wears a hat with a wide brim and light armour befitting of a knight with a white tone accentuated in red highlights. Her figure is slender. Also, do to overusing her spirit powers, her body temporarily becomes younger with her looking like a cute little girl.

The Magic in this Other World is Too Far Behind! (Manga)
Suimei and two of his best friends find themselves mysteriously summoned to another world. There’s a cute princess, magic galore, a Demon Lord that needs to be defeated, and a world that needs to be saved—the works! Too bad Suimei isn’t interested. His friends are all too ready to play the parts of heroes, but Suimei just wants to get home. He has an advantage as a magician... but he’s in for a rude awakening when he finds out what actually passes for magic in these parts.

The Magic in this Other World is Too Far Behind! (Light Novel)
Suimei and two of his best friends find themselves mysteriously summoned to another world. There’s a cute princess, magic galore, a Demon Lord that needs to be defeated, and a world that needs to be saved—the works! Too bad Suimei isn’t interested. His friends are all too ready to play the parts of heroes, but Suimei just wants to get home. He has an advantage as a magician... but he’s in for a rude awakening when he finds out what actually passes for magic in these parts.