This is Eleanor Branstone. She's 20 (started at Hogwarts in the Trio's fourth year), a Hufflepuff and a Muggle-born. She's an animal lover and works at the Magical Menagerie in Diagon Alley.
She's not really as friendly as a typical Hufflepuff, because when the war got really bad she was imprisoned for being a Muggleborn. It only lasted two weeks, and she doesn't remember what happened to her, but it's left her untrusting of people (she also suffered some spell damage, but she manages it with therapy and potions). But she's a very nice person and really couldn't be mean even if she tried. Other than that, she's the typical hard-working, trustworthy Hufflepuff.
Eleanor really wants to be social and be a people person. She just can't. She needs someone to help her open up and see that the whole world isn't out to get her.
Friends? Not-so-much friends? All that good stuff.