Luna the sweet princess... she's more like an anime version of princess Bubblegum. But well, it's a little bit of stretch there. Personally, I love to call her Lulu.
Overall, Luna is a child (technically not true, but whatever) with a remarkable set of skill. She is selfish sometime but unlike others, she looks cute when she throwns a tantrum. I never thought I would think like that, but she's really cute and cute people is rarely, or perhap never, guilty for doing something wrong.
Beside that, Luna has a lot of patience : a rare quality that lacking in even some full grown people. While she has heterochromia, but I think it's fine. She's cute and how can I blame her for that?