Katrina Muis

Not to be confused with Katrina SundayKatrina Muis is the deuteragonist of the Kate series. She is Kate's Belgian doppelganger who is the genius and works on complicated inventions. She was born in Belgium. She attends Teen Titan Secondary School and is a grade higher than Kate.

Appearance
Katrina is a teenage girl with fair skin, amber hair and blue eyes. She also wears glasses. Her attire includes a gold T-shirt, an orange-peel mechanic coat and orange pants. She wears brown mechanic boots with lace and jet soles.

Personality
Katrina is extremely intelligent, the most intelligent out of Kate's doppelgangers. She is into science, technology and engineering. She is also gentle-hearted, sweet-natured and loyal, though she will get angry when someone does something stupid.

Celine
Celine is Katrina's twin sister. Since Katrina is the hardworking, inventive, genius sister and Celine is the immature, spoiled, luxury-obsessive sister, they don't always get along. Katrina often offers to give Celine her inventions, but she usually refuses them. They also share the same room.

Kate
Kate has been best friends with Katrina since their 15th birthday. Katrina would invent important gadgets and gizmos for Kate's adventures. They trusted each other since then.

Kara
For the most part, Kara and Katrina share a friendly relationship with each other. They are usually seen together when teaming up with Kate.

Kayla
Katrina is close friends with Kayla.

Kari
Kari and Katrina rarely interact with each other, though they will team up with Kate.

Trivia

 * She is, perhaps, the most secular out of the eleven main girls.
 * She was born a genius.
 * She is the "Flanders" to Celine's "Wallonia", though she mainly represents the entire country of Belgium, as revealed in "A Fresh Start"
 * She is the only doppelganger who is a grade higher.
 * She speaks more Dutch, while Celine speaks more French.