Born in 1995, Lewis is a 12-year-old incredibly gifted boy in terms of intelligence. He loves to invent and has been doing so since he was young. While a generally kind kid who has good intentions, he can also let frustration cloud his mind. He easily becomes discouraged when his inventions don’t work or he begins to think about how he is almost a teenager and still an orphan.

As a little girl, she is assertive and knows karate. As the story progresses, she is shown in the future composing her own music and teaching frogs to dance and sing in a big band and jazz musical style. She is a caring, charming, fun-loving and inviting mother and wife.

Though Wilbur often finds himself in trouble, he always has a backup plan to get himself out of it. Impatient, Wilbur often moves quickly and during his time travels, uses stealth and generally acts in the manner of his fake persona as a “Time Continuum Task Force” officer until Lewis sees through his façade.

Carl is a robot who works for the Robinson Family. Built with a golden body and stretching parts, Carl’s general assignment is to keep an eye on Wilbur and keep him out of trouble.

Buford “Bud” Robinson (better known as Grandpa Bud in his old age) is the grandfather and patriarch of the Robinson family. He is a funny person. He likes to wear his clothes backwards. His eccentricity is shown when he has a painted smiley face on the back of his head. He has problems keeping his teeth inside his head.

Even at a young age, Lucille Krunklehorn was interested in science and adventure. Many of her favorite memories include her very first science fair, the day she got her first microscope, swimming the English Channel, and receiving a gold medal for the luge. But her favorite of all is her wedding day to a man named Bud Robinson, a science teacher who shared her quirky nature by wearing his clothes backward.

As a 12-year-old boy, Michael is more interested in baseball than his roommate's inventing hobby. He is mature for his age as he is willing to let go of his problems, albeit rather absent-minded as he can talk even without anyone else paying attention and not noticing this. He can also be immature sometimes, since he often snarkily remarks on Lewis’ hobbies being stupid.