Often, his siblings use variations of 'faboo', as in calling a male antagonist 'Dadoo' to annoy them. Like Yakko, he has a catchphrase: 'Faboo!' meaning fabulous or great. He's a big fan of Don Knotts from The Andy Griffith Show and, like his brother Yakko, he will also hit on any girl despite his young age. Wakko appears to have a voracious appetite in the show, and will eat almost anything, including gum found under a seat and even rocks for shock value or perhaps simply to see how they taste. Wakko is very flexible there are a few episodes where the others make use of Wakko for ladders and measuring tape. He is the most physical of the three, and thus tends to lean toward physical humor. Wakko generally supplies the more crude humor, which Yakko will often react to. More often than not, his tongue is sticking out of his mouth it will hang out at any given moment.

Wakko often carries a 'Gag Bag', from which objects can be produced as needed, and also uses a large mallet when situations call for it. Wakko speaks with a Scouse accent that Harnell explicitly modeled after Ringo Starr initially Harnell created a John Lennon-esque voice for Wakko until he saw that the character was short, so he changed it to a Ringo Starr-esque voice which he later raised the pitch.

Wakko is the middle child and the weirdest, most immature, and most absurd of the bunch, hence his name. Afterwards, as the audience throws roses onto the stage and applauds, he says 'excuse me!' He is also known as The Great Wakkorotti, in this personality he performs songs by belching to a tune. This was the only reference ever made to his age, but was not considered canonical by the writers. In the song 'Hello Nurse' he says he's 'seven' to rhyme with 'heaven,' though according to Tom Ruegger, Wakko is actually eleven. He also does not wear pants on most occasions, often joking about this aspect. He is the only one of the three that wears a shirt and has a red hat, which he wears even with other costumes. Wakko is arguably the most animalistic of the trio, as several segments have him behaving like a dog - walking on all fours, doing tricks for treats, etc. Wakko is the same species as the other Warners and is a little taller than Dot, but he is about the same height as Buster Bunny.

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