Sid is a cheerful and optimistic girl. She is quite energetic, notably trying pretty much anything that she thinks is fun. She likes skateboarding despite not being very good at it.
She's skilled in robotics, so she wished to join the school robotics club. She likes hanging out with Ronnie Anne so much that she can't stand attending to any extracurricular activities without her.
Sid is a light-skinned half-Asian girl with long brunette hair, no eyelashes (until the post-Casagrandes era), and freckles. She wears a blue long-sleeved shirt revealing her shoulders, black shorts, pink headband, white earrings, red socks, and black tennis boots. In "Face the Music with the Casagrandes", it is revealed that she has several calluses on her feet.