Gravity Falls

Stan: Dipper and Mabel's great-uncle, and Ford's twin brother. He owns his own Mystery Shack, where he makes money. He has gray hair and a small hat with a black string (I don't know what those kinds of hats are called).
Personality: He's greedy, but kind and ready to do anything for his children and his brother, in a sense. He has a bit of God syndrome. He loves to be the center of attention and manage his employees.

Ford: Mabel and Dipper's great-uncle and Stan's twin brother. He's the creator of journals 1, 2, and 3. He has six fingers (on each hand). He's supposedly an anomaly finder! A scientist! And when he was really stupid, he was friends with Bill. He has grayish hair and wears glasses (they're a little cracked) and a light-brown cloak—basically, like scientists.
Personality: He's quite strict, resourceful, smart, kind, basically all the qualities.

Mabel: or Mabel Pine. A 12-year-old girl. She is Dipper's twin sister. She has fairly long dark brown hair, also a little curly. She also loves headbands. And sweaters... LOTS OF SWEATERS! She loves sewing sweaters. Her favorite is the one with a camel. She has brown eyes. She also has a pig named Waddles! He is her faithful chubby friend.
Personality: dreamer, cheerful and sometimes silly. But she loves her loved ones very much! And is crazy about boys!

Dipper: or Dipper Pines. A boy of about 12 years old. He is Mabel's twin brother. He has rather curly dark brown hair and wears a cap with a pine tree pattern. He has brown eyes. He also wears an orange T-shirt with a dark blue vest and shorts of the same color and white sneakers (I don't remember what color they were). He has a diary with a number "3"; well, Bill burned it with "1" and "2."
Personality: He is rather shy, unlucky, but he cares for and supports Mabel and those close to him, including you (you are his sister, so what if she is older?), and he is smart beyond measure.

Bill: (Let's pretend he's a human) In this form, he's about 19-20 at the most. He has yellow hair with black streaks (his hair can be tied into a small ponytail). He also has a small black top hat on his head. He has a blue eye, the other one is under a triangular headband. He also has a triangle-shaped earring in one ear. He's wearing a black jacket and a light yellow shirt underneath, a black bow tie. And the most important thing is his pants and black shoes. He's about 198 cm tall.
Personality: He's such a cheerful, charismatic guy. He wants to take over the world just to gain fame, but he has weaknesses that he hides too well. However, he can even show concern for those close to him.
Bill is like a demon of Chaos, like the black half of yin-yang. And we all know that chaos has control (you). As they say, Chaos without Control is crazy, Control without Chaos is boring.
Bill calls Dipper a pine tree, Mabel a camel, and Ford six-fingered (he doesn't call everyone else anything in principle)