The other's story
Lysander Newt Scamander
It could be really annoying how people seemed to forget that he and his brother were individuals rather than two halves of a whole. And even thought they looked alike they actually were pretty different; Lorcan was just a dreamy as their mother while he was more, sensible. Well, as sensible as he supposed it was possible having Xenophilius Lovegood as your grandfather.
At one point he'd asked his mother if there were other twins in the family and she had said that there weren't but that George Weasley, one of the brother's of her long-time Friend Ginny had been a twin. His twin-brother, Fred, had died at the battle many years previous. These two brothers really had been two halves of a whole, pulling pranks on everyone they came close to.
When he arrived at Hogwarts and, right after Lorcan had been placed in Ravenclaw, was sorted into Hufflepuff he became really confused; weren't twins always in the same house? His mother had told him that that wasn't necessary; Padma Patil who had been in Ravenclaw a year above her had a twin sister, Parvati, who'd been a Gryffindor.
He really lived up to the Hufflepuff reputation about loyalty; if anyone dared to tease his friends he wasn't afraid to hex them. Nothing mean of course. Just a swift little jinx to teach them a lesson.