Nina Alexandrovna is one of the main characters in the anime Hina Logic – from Luck & Logic. She is a twelve-year-old girl with light gray hair and gray eyes, and she stands 145 centimeters tall. Her birthday is October 11, and she has blood type AB. Nina is known for her reserved and quiet demeanor; she tends to keep to herself and enjoys spending time alone reading or studying without interruption. Despite her outward seriousness, she has a fondness for fluffy, soft things, a trait that reveals a softer, more childlike side to her personality.

Nina is a highly skilled and experienced Logicalist, meaning she has the ability to use Logic Cards to manifest powers and fight against threats. However, despite her combat proficiency, she is sent to attend a special school because she still lacks something important. Over the course of the story, it becomes clear that what she needs to learn is teamwork and how to socialize with others. At first, she is reluctant to engage with her classmates, preferring solitude. But after meeting a character named Lion, she begins to open up. Through her interactions with Lion and other students, Nina gradually becomes more sociable and starts to form genuine friendships.

Her role in the story is that of a capable but isolated heroine who must learn to rely on others. Her development revolves around overcoming her solitary habits and learning the value of cooperation and connection. While she starts as an unexpressive and independent fighter, her growth is marked by increasing warmth and a willingness to be part of a group. Her abilities as a Logicalist remain a key part of her identity, but her personal growth is the central arc of her character.