She is a hardworking girl with a no-nonsense attitude who has a desire to improve her abilities. Being the youngest student at 15-years-old, she dislikes being treated like a child and can be impatient with those who annoy her. Despite wanting to look independent and mature, she has an intense fear of ghosts and is an avid lover of sweets, especially cake.
In-game, Lysithea is a very potent mage with unparalleled offensive power, but she has terrible defenses. She is often considered a "Glass Cannon" character, able to annihilate all but the toughest of opponents.
The reason for her impatience is because of her shortened lifespan, caused by being imbued with a second Crest when she was experimented on by Those Who Slither in The Dark.
Remarkably, she ended in the Top 2 of the 2020's edition of Choose Your Legends (women's side), making her the first non-main character to get a Brave unit in Fire Emblem Heroes.
