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troperville

Homestuck's Dave Strider - seriously, look at those bad boys.
Andrew Smith from Gunnerkrigg Court has thick, expressive eyebrows which can, in extreme cases, leave his face to float over his head.
The Book of Biff is a major example of this trope. Though Biff's eyebrows aren't bushy per se, they are very, very big.
Nothing Nice To Say has a minor running gag involving Fletcher's Big Ol' Eyebrows.
In The Inexplicable Adventures of Bob!, Rocko Sasquatch's eyebrows are so bushy that they completely obscure his eyes.
Rocky of webcomic Lackadaisy has some crazy huge eyebrows. They go well with his typically crazy expressions.
Art of Sequential Art, although he doesn't seem very conscious of it.
The early strips of Narbonic include gravity defying curlicues as the characters' eyebrows. The author herself mentions them several times in the Director's Cut.
Max Facepuncher of The Fancy Adventures of Jack Cannon.
Agatha's eyebrows in Girl Genius seem to wax and wane with her moods ... even within the same page.
McCoy from Mushroom Go has bright orange eyebrows that have gotten larger over time, and sometimes narrow when he's surprised.
Rittz of Boxer Hockey has 'em, especially when compared to the other characters.
Guz in Fite!, though it depends somewhat on the current state of the art.
Tubs of Waterworks, apart from being a tubby super-strong thug with a Badass Moustache, also has bushy eyebrows which also serve a practical function, protecting his eyes from pepper spray.
In El Goonish Shive, Dex has ones almost as tall as his eyes.
Dwayne of The Jupiter Palladium has some pretty awesome brows.
MS Paint Masterpieces sees Mega Man get them in this strip for a dramatic moment with Cut Man.
The wizard at the Temple of Terror in The Fourth has eyebrows that nearly double his height.
Questionable Content: Marten (and some other guys, like Steve) used to have surprisingly thick eyebrows, but that was before the Art Evolution. Compare with this strip.
Many characters from Zoophobia have this. Most notably Alanzo, Jack, Spam and Zill. And boy are they expressive- each character's Big Ol' Eyebrows convey a different state of mind (smug, ecstatic, anxious, etc).
Nin Wah and Ace sport some pretty impressive ones in Commander Kitty. Particularly noticeable due to everyone else just having single lines that only show up when they're needed for an expression.
Goblins
- Minmax being bald, his only "facial hair" is his bushy black eyebrows, making them very noticeable. To the point where out of all of his "Maze of Many" incarnations, the eyebrows are the one thing that remain consistent.
- Forgath has technically even bigger eyebrows than Minmax, but his dwarf beard make it less obvious. One alternate Forgath pushes this into a whole obsessive level.
Many characters from Every Button Hurts the Other Guy have large eyebrows, but Shota and Russel go as far as having the classic, thick, black rectangles, and Russel doesn't even have black hair.
- In Russel's case this is likely a parody of Ken Masters from Street Fighter, whose eyebrows are conspicuously a different colour than his hair.