Scooby-Doo characters

Scooby-Doo

Scooby-Doo and Shaggy share several personality traits, including tremendous appetites and tendencies toward cowardice. Due to their said cowardice, Scooby-Doo, as well as Shaggy, would often have to be bribed by their cohorts (Velma, Daphne and Fred) to go after the costumed villains with "Scooby Snacks," a biscuit-like dog treat or cookie snack, although sometimes, Scooby Snacks won't work on Shaggy, so he may get "Shaggy Snacks".
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Shaggy Rogers

Both Shaggy and Scooby-Doo have nearly insatiable appetites, as well as tendencies towards goofing off and cowardice. Due to these similarities, Shaggy typically treats Scooby as a normal person rather than his pet. Shaggy uses his catch phrase "Zoinks!" whenever he's surprised or scared, which is frequently. Although usually considered a coward, Shaggy often proves useful in ferreting out the "monsters" and "ghosts" that are usually at the heart of the gang's mysteries (sometimes by reluctantly acting as "live bait" for a trap), and providing a necessary distraction for their eventual capture.
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Fred Jones

The leader of the group, and (usually) the driver of the gang's van, the Mystery Machine, Fred is a blonde, neckerchief (often confused for an ascot)-wearing, statuesque and brave youth; everything that the group's other male human member, Shaggy, is not. In later spinoffs, Fred is also shown as having a great interest in various types of sports.
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Daphne Blake

Together with her other teenage cohorts, Fred Jones, Shaggy Rogers, Velma Dinkley, and Shaggy's pet Great Dane Scooby-Doo, Daphne would engage in solving various mysteries the gang would run across.
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Velma Dinkley

Velma is the most intelligent in the group and often makes great use of her skills in such areas as reading Chinese, deciphering scientific formulae, operating communications equipment, and so forth. A running gag of the series is Velma's trouble with keeping her glasses on her face (usually from being accidentally knocked off of her face while being chased by the villain), as she is very nearsighted. When Scooby and Shaggy are too afraid to volunteer for a mission (which tends to be most of the time), Velma often offers him a dog treat called a "Scooby Snack" as a bribe.
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Scrappy-Doo

idolizes his uncle Scooby and would often assist Scooby and his friends in solving mysteries. With a highly energetic and brave personality, despite his small size, Scrappy was the opposite of his uncle; Scrappy would usually insist on trying to directly fight the various monsters Scooby and his associates encountered. Related to this, one of Scrappy's catchphrases was, "Lemme at 'em! I'll splat 'em!" Another of Scrappy-Doo's catchphrases is, "Ta nanana ta daaa! Puppy power!"
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Scooby-Dum

Scooby-Dum, a Blue Merle Great Dane with spots, buck teeth, and a generally dim-witted demeanor, is Scooby-Doo's cousin. Dum lives with Ma and Pa Skillet in the Okefenokee swamp of southern Georgia. Whenever Doo and Dum greet each other, Scooby-Doo yells, "Scooby-Dum" and Scooby-Dum says, "Scooby, doobie, doo." They then do a special handshake involving two high fives.
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Yabba-Doo

Yabba, Scooby-Doo's brother, is a white Great Dane, shown to be more courageous than his cowardly sibling. His adventures take place out west, where he fights crime with his master, a bumbling deputy named Dusty, and his enthusiastic nephew Scrappy-Doo. In contrast to Scooby's catchphrase of "Scooby-Dooby-Doo!", Yabba's was "Yippity-Yabbity-Doo!", presumably due to obvious reasons.

In the series finale of the show Yabba was kidnapped by the dognapper from an episode of Scooby-Doo Where Are You. He was never seen again after this and his location was never revealed. Scrappy and Yabba-Doo aired as a backup segment of The Scooby & Scrappy-Doo/Puppy Hour from 1982 until 1983.