Four and a Half Friends

Charly: he's the founder of Charly & Co. Detective Agency, because he loves mysteries and detective stories. He's stubborn, brave and always optimistic. He's intelligent, sporty and popular at school.
Dandy: he's a former stray dog who was adopted by Charly and his team. He's best friends with Fred, but loves all the others too. He's very intelligent and can sense danger from miles away thanks to his impressive olfactory skills.
Fred: he's a simple and lovable teenager, who's emotionally intelligent and has got strong intuition.
Radish: he has a whole range of practical skills to complement the team. His real name is Oscar and he's Stefy's twin brother.
Stefy: she's a smart and straight-talking girl, who's very good with computers and data-analysis. She's Radish's twin sister.
The Cybercrew: they are a group of three gamer kids who are in the same class as Charly and his friends. They like to think of themselves as rivals to the Detective Agency, but cooler and more awesome.
Handsome Harry: he's the children's maths teacher. He's a complete narcissist and thinks everyone loves him, including all the female teachers. But in fact, nobody can stand him!
Mrs. Stratford: she's a great teacher of biology. She loves to organize outdoor school trips and visit exciting places. Fred is very much in love with her.
Mr. Siggi: the strict headmaster of Charly's school. He only cares about the rules, and has no understanding of human emotions.
Flitz and Bongo: these two dogs are Dandy's friends from the old days. They act like his informants on the street.