(!) Contains headcanon.

Spoilers!!

Tomoe Mami (Mami Tomoe, 巴 マミ) is a character in Puella Magi Madoka Magica. She saves Madoka and Sayaka from a witch in Episode 1. She had previously made a contract with Kyubey and offers to be a mentor to train and help the two girls decide if they want to become Magical Girls. She is a powerful veteran who fights with summoned muskets and ribbons, as well as a ladylike older sister figure who enjoys tea. Mami, eager to acquire new friends, demonstrates the glory and intoxicating thrill of magical heroism, but also shows Madoka and Sayaka the terrible danger inherent in entering a witch's domain.

In the spin-off manga Puella Magi Madoka Magica: The Different Story, Mami is a main protagonist, along with Kyoko Sakura.

Source: https://madokamagica.fandom.com/pt-br/wiki/Mami_Tomoe