Sonia is a cheerful and polite girl with a great interest in Japanese culture. Being a princess, she takes a great interest in many rather ordinary things as well, such as cleaning and even the Japanese restrooms, due to not being familiar with them. She firmly wishes to be treated like a normal Japanese high school girl and her big goal is to have friends of her own age and status. Due to being a foreigner, she occasionally messes up figures of speech and has a tendency to use outdated slang.