She acts as a mentor to Madoka Kaname and Sayaka Miki should they choose to become magical girls by making contract with Kyubey.

[2] The color of her soul gem is orange,[3] and when transforming into her magical girl outfit, her hair ornament is attached to the right side of her head.

[4] She lives alone in an apartment after the death of her parents in a car accident, during which she was only able to survive by contracting with Kyubey to save her own life.

Mami fights with the belief that she would protect others from the threat of witches and their familiars, and her appearance had a great influence on Madoka and Sayaka.

[7] Having been ignorant of the magical girls' purpose and the witches' true nature, Mami learned the truth in one of the previous timelines in Homura’s timeloops.

[11] Puella Magi Madoka Magica the Movie: Rebellion shows that Mami has the potential to become one of the most powerful magical girls if in peak form when she isn’t held back by her crippling loneliness (as a result of her becoming close friends with Charlotte’s original form Nagisa in the guise of Bebe).

After Homura rewrites reality, Mami is seen saving Nagisa from falling packages of cheese, implying the two remain friends.

[14] She also appears in a novel adaptation of the original series written by Hajime Ninomae, illustrated by Yūpon and published by Nitroplus.