Miriam is a tall, 13-year-old teenage girl with light skin, curly, auburn hair tied in braids, freckles on her face, and green eyes. She has pearl earrings as well as braces and a green beanie. She wears a plaid green jumper with a black choker with a light green stone in the middle with what seems to be a flower inside it, and a white t-shirt that reads "SK8R" in light orange, along with leave green pants and dark magenta slip-on shoes that have a checkered pattern by the side. She has a rainbow friendship bracelet on the right arm and a green and light green slap bracelet on the left.
Miriam is a fun-loving and caring girl who looks out and supports her friends. She is easygoing, loyal, a bit of a tomboy, and can make people laugh when they need it most. She is also very nurturing and kind, especially towards Mei, whose life has been turned upside down by her red panda powers. Miriam always lets Mei know she is loved, no matter what she looks like.
- On Miriam's skateboard, you can see a Lightyear sticker, referencing the upcoming movie, Lightyear.
- Miriam is represented by the color green. This works in contrast to Mei who is represented by the color red. Green is usually a sign of calm, relaxation, and nurturing. This best represents Miriam as she is the most comforting toward Mei and is usually the first to reach out to her when things are going wrong with her.
- Miriam is implied to be Jewish judging by her curly hair and distinctly Hebrew given name.