In fact, He and Donald's rivalry made perfect chemistry in Who Framed Roger Rabbit when they were playing pianos.
His famous catchphrase "Youuu're dessthpicable!" never gets old.
He has a habit of fourth wall jokes and entertaining viewers with his own gags, which is really typical for cartoons.
His other personality is being a screwball character, which can be funny and annoying at the same time.
The funny running gag in some universes, like Space Jam, is considered the least favorite Looney Tunes character, much to his dismay.
He greatly redeemed himself in 1970, and has remained his lovable self since then.
His rivalry with Speedy Gonzales is considered a terrible rivalry, and is more likely a rivalry fit for Sylvester since cats and mice don't like each other.
Speaking of which, this rivalry was also a factor that contributed to Daffy's flanderization from 1964 to 1969. Thankfully, he has recovered since 1970 after they stopped his rivalry with Speedy Gonzales.
While very funny, he can be very mean-spirited when he is considered the least favorite Looney Tunes when in real life, he isn't.
He can be annoying because of his jerkassery at times, even as a goofball character.
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