Jalter represents the Alter counterpart of Jeanne d'Arc. However, being designated as an 'Alter' does not indicate a mere alternate aspect of Jeanne d'Arc. Instead, she represents the embodiment of vengeance attributed to Gilles de Rais,Jalter exhibits a striking resemblance to her original counterpart, albeit with distinctive features. These include a notably pale complexion, yellow eyes, short-cut white-blond hair with an ahoge, and a darker color palette for her armor, flag, and cape. From stage 3 and onward, Jeanne Alter's armor becomes more revealing, and her shoes become high heels. Notably, she gains long flowing hair that reaches her ankles..

Jalter seethed at the idea of Chaldea's forces escaping her, as she stood in the crossroad in the center of a plaza, while blazes of fire surrounded the Dragon witch.

"Find them, Bring them to me, NOW!!." Her soldiers nodded, unwilling to annoy their supreme Commander.