Harvey is a failed third-rate super hero, who has traded in his volcano base for a corner office in the law firm of Sebben & Sebben after growing tired of the stresses of fighting crime. Now a third-rate lawyer, he is determined to solve the case to which he has been assigned though occasionally he loses sight of the people in the case whenever more personal problems appear. Aside from being a mediocre lawyer, Harvey struggles socially as well, having poor luck with women. He also is not too quick on the uptake when it comes to Mafia-like threats. Some characters, like Boo Boo and Magilla Gorilla, have revealed a bisexual side but he is part of a marriage to a gorgeous redhead named Gigi.
He gets strength and power from sunlight, and grows weak if kept away from the sun for too long. His superpowers include flight, the ability to create a shield of solid light, and the ability to shoot destructive energy beams from his fists. These powers are thought to stem from the crest on his helmet, though Harvey isn't entirely sure of the crest's true role in his powers. He also has large wings growing out of his back, genetically inherited from his father.
He is involved in an 8 way marriage to Gigi, ironically being the only one she will not kiss or sleep with. Gigi cannot even remember Harvey's own name, often referring to him as "Henry".
Harvey still wears his Birdman mask down to the collarpiece, along with every outfit he wears. In Death by Chocolate, the Birdman costume appears on Harvey's arms when he rolls up his sleeves, although his arms would be bare in every instance following. In Guitar Control, Mentok rips the entire Birdman costume out from Harvey's current outfit.
In several early episodes of Season 1, pupils would randomly appear for a brief second in Harvey's eyes, typically in moments of distress.
There was a brief period where Harvey was a “bachelorette party entertainer.”
It’s unclear whether he ever completed – or even attended – law school. He seemingly received his law degree from a three-hour correspondance course. In The Bird Girl of Guantanamole, he is quick to criticize Judy Ken Sebben, then disguised as Bird Girl, for achieving a diploma from the same course, but is quick to overturn his own degree when inspected by Peanut. This is again referenced in the Harvey Birdman: Attorney At Law Volume 2 Boxset, the digipack case inside is made to look like a fake book written by Myron Reducto called " Reducto Guides-3 Hour Law School" with a picture of Harvey saying "I Got My Degree Over Lunch!!!"