Valentina Remno

Background
Valentina Remno is the first princess of Remno Kingdom and Abel's oldest sister. As a princess of the military kingdom of Remno, Valentina is taught how to use a sword by the royal instructor, Gimmie Mafias? (Dude's name is waiting for official translation).

Valentina is said to have died after her carriage fell off a cliff, but her body couldn't be found. Valentina managed to survive with the help of a former priestess and chief from Equestrian's fire tribe, and she was entrusted with The Book of Those Who Crawl the Earth as its next priestess. She believed that her own father and his men tried to kill her.

Appearance
Valentina is a beautiful woman in appearance with long black hair. In Miabel's timeline when she presents herself to Empress Prelate, Valentina's hair has start turning white.

Personality
Valentina was a strong woman who believed misogyny is wrong and she worked harder than anyone else to fight the absurdity of her kingdom. Seeing how Gain turned out, she wanted at least Abel to be kind to women.

As priestess, Valentina doesn't hesitate to kill her own brothers.

Abel Remno
Abel is Valentina's younger brother whom she taught to be kind to women. Abel looked up to his older sister, and he considered her aura to be dazzling. As priestess, Valentina wanted to kill Abel so Mia can suffer. Even though he loved her, he'd kill her to protect Mia.

Gain Remno
Gain is Valentina's younger brother. When they were younger, the siblings supported each other with Valentina giving Gain military advices and Gain didn't mind taking the blame for her. Gain complimented his sister's efforts of keeping up with both swordsmanship and princess studies. Gain believed her talent is second to none in the castle and he praised how hard she tried to fight the absurd misogynistic nature of Remno. However, he also believed Valentina is a foolish woman who died accomplishing nothing and it frustrated him that her hard work isn't rewarded. Yet, to his surprise that she's alive and well. Gain often visits Valentina in prison and his presence disgusts her.

Gimmie Mafias (Dude's name needs official translation so please edit when Volume 10 comes out in English)
He is a royal instructor who taught royal children how to swing swords. He knows Valentina's skills and how hard she worked.

Mia Luna Tearmoon
Mia is desperate to save Valentina because if Valentina dies, her relationship with Abel would be strained.

Miabel Luna Tearmoon
Abel's granddaughter whom he advices to call Valentina grand-aunt when they visit her.

Citrina Etoile Yellowmoon
Valentina kidnapped Citrina to lure in Mia.

Trivia

 * Valentina is somewhat a yandere.