Woke up on one day to find out that he had turned into a girl. He (now she) also learns that her transformation is due to her being half alien. She has to get used to her new powers while hiding everything from her friends, but she's not really happy about doing so. 

The older brother of Chris. He cares a lot for his younger sibling, but he can't himself from being jealous. Whether he's jealous of the fact that his brother turned into a girl or the fact that his younger sibling can now use special powers, he won't say. 

Mother of Sam and Chris. She happens to be an alien that married a human man. She cares for her children and trains Chris. 

A bit of a laid-back guy, who is supportive of everyone in his family. He managed to marry an alien woman.

Chris' best friend. He's a pretty reliable and trustworthy person who becomes very concerned when his best friend seems to have "disappeared". 

Phil's younger sister who has a bit of an energetic and cheerful personality. She's actually pretty smart and capable of figuring things out.

An evil alien girl that one day appears in Chris' class that wants to take over Earth.