She hopes to find a way to create a safe dungeon. Marcille is a half- elf with long blonde hair, green eyes and rounded elves ears, an indication of her being a half-elf. In her normal dungeon attire, she wears a long blue dress with white pants, a blue cowl, a red choker, and sandals. She styles her hair differently every day. Marcille is intelligent, principled, and loyal to her friends. Despite this, she can also be very high-strung and has a difficult time dealing with things far outside her comfort zone such as eating monsters.
She can also feel a bit self-conscious when using dark magic, which she knows to be illegal, as shown with her nervousness when telling her other party members about her plans to revive Falin. When others look down on her for using dark magic, she has a tendency to feel extremely guilty about it, as shown when she faced Shuro's anger at the methods taken to revive Falin. Despite this, she seems confident that her methods, though taboo, may be the most promising for the future.
She can be very pushy with this, but her curiosity seems to be genuine and not malicious. She has deep fear and complex about losing people as her half-elf blood means she will outlive most if not all her friends and loved ones. Not helping the fact is that while she is half-elf from her mother's side she predominantly lives in the "human" world with very little connection to the Elf world. Many Elves look down on her for her half-blood status.
A large part of her trauma stems from her childhood; while she was born when her father was a young man her slowed aging meant that by the time she developed enough to form memories her father had become an old man. While she spent decades with him, to her he was only around for a short time. As a result her only memories of him are that of him slowly dying and withering away while her mother became devastated by the loss. This left a traumatic impact on her which led to her complex of eventually losing everyone she loved and dying alone.
Marcille is a magic user who appears to specialize in fire-type magic, [14] relying mostly on explosion spells to defeat enemies. She can create familiars from scratch, and also appears to be knowledgeable in appraisal and dispelling curses on items. Marcille can do headstands. Falin is Marcille's closest friend.
