He is amused by most anything, and very few things are able to disappoint him. Wakko is very sweet-natured, loving, laughable, and positive. The younger brother with an unlimited slapstick energy and an appetite for pranks-and anything else he can fit in his mouth. Series creator Tom Ruegger says that the Warners are simply toons, and that their species is cartoonicus characterus. They also do not rule out the possibility of being related to humans. He also states that he and his siblings are infertile 'like mules ' the reference to mules implies that, like them, the Warners are some kind of hybrid. Wakko says that he is 5% salamander, before demonstrating an ability to remove and regrow his tail. The Warners seem to have some idea of what they are, though they also do not know entirely, as Dot questioned if their DNA test could reveal such information. Wakko especially tends to show canine traits, such as barking, chasing frisbees, or doing tricks for treats. The siblings, mainly Wakko, do show traits of some of these animals, though the siblings have been seen howling like wolves or stretching like cats. They have explicitly specified that they are not: bats, bees, bugs/insects, bunnies, cats, dinosaurs dogs, eels, elephants, horses, monkeys, penguins, rabbits, seals or skunks. When asked what they are, the Warners will never give a clear response, with their main answer simply being that they are the Warner brothers and the Warner sister some other responses include 'cute' and 'infested with fleas.' The Warner siblings' species is never specified, much to the confusion of the other characters. In the 2020 revival, he has grown a small tuft of hair on the top of his head, a smaller version of his hair tuft that was briefly seen in ' The Senses Song.' Wakko also consistently has his tongue sticking out of his mouth. He often doesn't wear pants, and implies that it's 'in his contract' that he doesn't have to. He wears white gloves, a red, backwards baseball cap with holes where his ears stick out and a sky-blue turtleneck sweater. Wakko has primarily black fur, with a white face and paws as well as a red nose.

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