Velma has a brilliant, calculating mind, and is perhaps the most vital ingredient to the group's identity as detectives. Her brain is the engine that puts the pieces of the puzzle together, regardless of whether or not she gets credit for it. But Velma is more than Mr. Spock in a pleated skirt; she's a realist and can't help momentarily pointing out the possible flaws in Fred's scheme-before the gang goes ahead with it anyway.
Fred is the absolute, unquestionable leader of the group. His infectious confidence seems to draw the others along with him, no matter what. Like many great leaders, Fred doesn't waste much time weighing options and repercussions; he simply acts. Fred's boundless optimism verges on obsession. The glass of milk isn't just half-full; it's three-quarters full! And it's probably a clue to boot!
Sensitive, beautiful, and accident-prone, Daphne is the Scooby Gang's heart. Though clothes-conscious and fashionable, Daphne is a modern woman who believes "a girl is never fully accessorized without a strong opinion." She is both strong and smart, with her insight based on emotion. While her suspicions don't necessarily solve the case, they're almost always accurate.
Scooby is a big cowardly Great Dane who is easily bribed with Scooby snacks. His best friend is Shaggy, and the two of them are constantly pulling pranks on each other, mostly trying to steal each other's food. Scooby is 100% loyal, though. He would do anything for his friend. When faced with a scary monster, Scooby runs away really really fast, and best friend, Shaggy, is right there beside him.
Shaggy has three basic drives: sleep, safety, and food. Four basic drives if you count "food" twice. Shaggy's appetite is unrivaled except by his best friend, Scooby's. Shaggy would rather slack off and pig out on triple triple-decker sandwiches than solve ghostly mysteries. Basically, Shaggy is a beatnik, hippie, slacker, and trip-hop homeboy all rolled into one laughing, sandwich-eating, monster-fleeing guy.