Margaret is energetic, rash, impulsive, but fiercely loyal. Unfortunately, she's not very smart and can't seem to read the atmosphere most of the time. Prone to being a bit selfish due to her privileged upbringing, she's learning how to be more considerate of others, however she's still often scolded to mind other people as much as she does to herself.

She has light gray eyes and pale skin which burns easily. Her hair is ash blond and reaches up to her shoulder, often tied back because she finds it bothersome.

Her parents are both wizards, her mom comes from a strict pure-blood family (but she's slowly trying to change the elitist world-view of her damily) and her dad is muggle-born causing her to have muggle cousins. Her family lives in her mom's home with her posh pure-blood grandfather but they go to her dad's family home in the weekend to play with her cousin who is the same age as her. It's the most exciting part of her week because they play muggle games with her cousin's friends that Margaret finds very exciting and interesting like "football" and "tag".

Her magic first surfaced when she lost a game of football. Being a sore loser, she threw a tantrum and the ball exploded very aggressively while being held by a laughing playmate.