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Northern Melania Black. Younger sister of Sirius Black and twin to Regulus Black. She was a Hufflepuff. Loved being with both of her siblings and enjoyed hanging out with her brothers' friends as well. Though her favorite pass time was tricking Potter and her brother. Her favorite time was this.
The Marauders and Co. plus North and a few others sitting in the Gryffindor common room. North was sitting next to Dorcas and Maia who was a Slytherin in the same year as Sirius. James and Sirius were practically yelling at each other even though they were sitting side by side. North was telling Lily about how Sirius would always be so petty when it came to their cousins, and Sirius being Sirius overheard but not correctly, so he just blurted out “Damn right I’m pretty Thorn!”
And Northern being Northern told her brother, “Ri-Ri I said petty. Not pretty.” and then everyone promptly burst out laughing.
Let's just say Sirius got a little bit pettier after that.