- "That's not what I'm complaining about! You're supposed to be the group leader you know!"
- — Cello —
Her appearance is like that of the typical pixie. Cello has a cheerful expression, she also wears a large ribbon on her head, has long and large blueish-green hair, and has angel wings attached to her baggie pants. She also carries a strange stuffed animal named "Guri-chan". However, with her custom class of "Beast Tamer" she actually uses this animal to attack for her by making it grow long claws, biting its enemies, or expanding in size.
Cello's player is Lilie Weiss, a 10-year-old German girl. Lilie lost her parents in a terrible accident at a young age and suffered from Post-traumatic stress disorder until receiving treatment from Dr. Ryuuji Sogabe. After this she was able to regain her past cheerfulness, and Ryuuji adopted her.
- "Cello" is short for "Violincello."