Dib is a young, eccentric boy who possesses a fascination with unexplained paranormal phenomena, such as ghost hunting, Ufology, and cryptozoology, as well as with the supernatural and occult. Dib and his sister Gaz are the only children attending Skool who realize Zim is an alien, but only Dib seems affected by this and even becomes obsessed with the idea of exposing Zim. Fortunately for Zim, Dib is unpopular at School, and none of the other children will even listen to what he says, let alone believe what he is saying. Dib quickly becomes Zim's greatest enemy, and will stop at nothing to deter him from conquering the Earth. He is elevan years old and resembles his father, Professor Membrane. Both have black, scythe-like hair.Many people claim that Dib's head is big, a running gag in the show. His hair spike seems to be solid, and retains its shape even when getting wet. Dib seems to be able to zip-line with his hair spike (using the spike as the runners), likewise it seems solid enough to punch through a brick wall. Dib is incredibly determined and intelligent, and continues to hunt the paranormal despite being put down by his peers and family. It's unknown whether or not Dib hates all aliens, or just aliens that threaten Earth (like Zim). He also shares his father's intelligence; proving to be very adept at creating things and quick to pick up on alien technology. Dib is also obsessed with his favourite television show, Mysterious Mysteries. He even gets to make an appearance on the show in the episode 'Mysterious Mysteries', though he has evidently appeared on it before and it resulted in the anchorman of the show somehow acquiring a scar on his face, though how is unknown. Dib is often called "crazy" or "insane", and is constantly being mocked for his theories. He even got put in a "Crazy Bucket", a possible alternative to a straitjacket. Overall, most of his classmates try to ignore him. Dib's also known by NASAplace and even the FBI for his paranormal-related antics. He's been on the front page of the newspaper twice, so it's possible that a good deal of the city is aware of the trouble he frequently ends up in.

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