Sunstar would be tall and stocky, with curly red hair and bright green eyes.
Auroralights would be slim with long legs, but she would still be really short, and she'd have wavy brown hair with blue eyes.
Flappypaw would have wavy dirty blonde hair and green eyes, and he'd be pretty tall.
Nerfpaw would have dark brown hair and light brown eyes, and wouldn't be very tall, but he'd be muscular.
Downkit would be a little on the chubby side, and have really light blonde hair and light blue eyes.
Idek about Rivuletkit.