Alyssa had pretty turquoise eyes with dark blonde wavy hair that falls up to her shoulders, just slightly longer. She's around 4'8, and not way to skinny or too curvy either.
She has a very sunshine-y personality and is always energetic, and a very outdoor person. Extroverted, but not like the popular girl, but everyone knows her. She's friendly, but sassy and knows her self worth, and doesn't take any shit from anyone.
She's born into a pure blood family, but the Pevensie family aren't very strict about the purity of their blood. They encourage Alyssa to know about muggles, while also having adequate knowledge about the wizarding world. She's grown up hearing about the golden trio, and wants to meet them irl someday. She has an older brother, but the age difference is around 10 years, so they're not very close, but yet have an affectionate bond. The older brother lives alone and works at Gringotts. Her parents are very loving, and very good too.
So Alyssa's first instance of magic was when she 6 years old, and was playing fake quidditch (without brooms, as their parents didn't want them to get hurt) with her neighbors, and the neighbor's kid, Wes, cheated in the game, they had an argument, and she accidentally burst the toy Quaffle. This was because she was passionate about quidditch and hated cheating. Alyssa always puts herself first, not because she is selfish, but because she knows how cruel the world is, and that's the only way to survive the real world out there. She's very practical and logical, yet very empathetic as well. She understands people very well.