Nina Achenwall (ニーナ・アッヘンヴァル) is a student of Queenvail Girls' Academy. Her reason for entering Queenvail is to earn money to give to her parents as her family is poor.
Nina originally had a timid personality, easily getting frightened by people like Chloe, and was initially distrustful of others due to being used by Sandra, who got rid of her after their loss in the Phoenix, deeming her to be useless. However, through her interactions with the rest of Team Kaguya, she gains courage, and comes to completely trust the other members.
Nina feels a bond with Chloe, as they are both Strega, and once became defensive about her when Petra referred to her as a tool, as she herself had been a "tool" to Sandra.
Strega (魔女): Nina uses moves named after a suit of cards which is what she imagines when using her abilities. The spade is used for close combat, the heart for ranged combat, the diamond for defense, and the club for support. The power of her moves vary depending on the number with the suit. Once used, a combination of a suit and number must take 24 hours to reset.
- Seven Falchion (七裂の葉剣): Nina creates a sword that she uses to attack her opponents.
- Eight Falchion (八裂の葉剣): Nina creates a sword that she uses to attack her opponents.
- Nine Bullet (九轟の心弾): Nina creates a number of heart shaped arrows that shoot out at her opponent.
- Nine Jail (九封の牢獄): Nina creates an energy field around her opponent that prevents them from moving.
- Jack Rampart (王太子の城壁): Nina creates a shield to protect herself or an ally. It is strong enough to block an attack from an Orga Lux.
- Jack Jail (王太子の牢獄): Nina creates an energy field around her opponent that prevents them from moving.
- Queen High Straight (女王の崩順列): Nina creates a rocket like object from the Eight of Diamonds, the Nine of Diamonds, the Ten of Diamonds, the Jack of Spades, and the Queen of Hearts. It is powerful enough to defeat Sandra Segur, a Page One, and destroy the water dragon created from her Orga Lux in one hit.
- Queen Jail (女王の牢獄): Nina creates an energy field around her opponent that prevents them from moving.
Genestellar (星脈世代): As a Genestellar, Nina has enhanced physical ability and an aura known as prana.