Hey, guys, I'm Emily. I've been looking for a place to toss my take on Mafalda Prewett for a while, whether it be a PSL or a game. She never did well on any of the other sites, so I figured I'd try here.
Mafalda is loosely based on a character Rowling cut out of/replaced in Goblet of Fire. Since she was replaced by Rita Skeeter, I kept some basics of her character, while also altering her actual storyline. She's a distant relative to the Weasleys, born to a muggle and squib. When she starts showing signs of magic, her parents dump her off with their magical relatives (the Weasleys, obvs) to prepare her for Hogwarts. At Hogwarts, rather than getting sorted into Gryffindor like the rest of the gingers, she's sorted into Slytherin. She very much embodies more of a "Slytherclaw" personality, but the hat decided to put her in Slytherin. She's fairly studious, at least with Potions, and would love to be a Potions Mistress one day. The studious side comes from a similar place as Hermione's - growing up without magic, so having a lot to catch up on. Especially in a house where everyone thinks they're the best. She's very ambitious and doesn't take crap from anyone, her time in the snake house giving her tough skin. She's not outwardly nasty, one of the nicer Slytherins unless given a reason to be otherwise. She has issues of feeling fairly unwanted, due to being ditched by her parents, being an outcast with the Weasley's (random relative, Molly doesn't particularly like her parents, sorted into Slytherin), and she's not overly accepted into her own house, but she tries not to let it bother her.
Some things, such as her relationship to the Weasleys, and her canon point are open for debate, it's just her general outline. Like I said, I'm down for either PSLs or games.