Suzune has amber eyes and long black hair. She usually wears a white shirt, a black undershirt, black tights, and a flower shaped hair accessory.
Suzune is friendly to anyone she comes across. Originally, she knew nothing about the Darwin's Game, and her trying to look into her father's death almost resulted in her death. Despite facing an experienced opponent, she didn't back down, stating that she was already resolved to die. She is good friends with Kashiwagi Rein due to both being close in age and the fact that their names are spelled the same way.
After the timeskip, Suzune has gotten more assertive and confident in her abilities, asking Danjou to allow her to return to Out of Range Village on her own. She is observant, noting that the Greed were attacking as a coordinated force, though she is shown to potentially make poor decision such as considering attacking a human Greed.
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After the timeskip, Suzune has become much more skilled at using her sigil, easily dealing with a group of Greed that attempted to attack her. She is more assertive and confident in her abilities as well, asking Danjou to allow her to head back on her own since she could be of help the most. She is also able to see in the dark, though it is unknown if it is due to her sigil.