Xina Akiyama

Xina Akiyama (秋山チャイナ;Japanese) is Phineas & Candace's cousin and Ferb's step-cousin. She lives in a huge house in a private village in Danville.

Personality
Although in outside she was polite and quiet on inside she has a tomboy, energetic & athletic personality. She join various sport teams in Japan. But her parents, were not satisfied with with her dreams and what she achieve so she was force to alter her personality from a Tomboy to a Mature girl.

Phineas Flynn
Phineas and Xina are actually fighting in their childhood years according to Candace. They even wrestle each other when they were three. But they forgot about that. They are close friends after Phineas with his step-brother Ferb made a invention that made Xina happy.

Ferb Fletcher
They don't have interaction (For now) but he makes Xina happy when he & Phineas made a invention in a episode.