Lassy McKenzie is the Advisor of Roselia McKlennington, and a first year student in Athena Academy. Unlike her boss, she is quick to act on her feelings, and has a bad habit of getting flustered by smallest things, leading to panic that expresses itself through various forms. She is the younger sister of Leila McKenzie a witch of notable power who possed the Noble Phantasm Dyrnwyn. Her sister has since gone missing and she is currently being looked after by Roselia
She seems to possess knowledge of wrestling and martial arts.
said to be on a similar level to the PC's
On day 1, she wore a cute pair of red underwear with white stripes.