"Sure, it may seem like just another comic book, but there's a crucial KaBlam-difference."
Henry is tan-skinned with freckles and has green hair. He wears a blue shirt designed with an upside-down smiley face, red pants, and yellow shoes.
In Season 1, Henry is shown to be smarter than June and more like an older brother to her. In the second through fourth seasons, he is more clumsy, dim-witted, and his voice is deeper.
Henry is also prone to the majority of the show's accidents, including getting hurt by Mr. Foot, the show's Sasquatch (Bigfoot).
Henry is also seen as a romantic, having crushes on Action League Now! star Thundergirl (in the Season 1 episode "Comics of Champions") and Dawn, network executive Fred Stockdale's granddaughter, in the Season 4 episode "A Nut In Every Bite!."
Some of Henry's skills include singing (although not very well), dancing, and playing the guitar.
Relationship with June
Even though Henry often ends up at the receiving end of June's jokes, they have always remained close friends. There have been threats to their bond – most notably in the Season 2 episode "Won't Stick to Most Dental Work!," in which Henry got tired of being made fun of and left his hosting job — but they got back together in the end.
Henry teaches about the art of chuckimation in the Action League Now! segments to June in the Season 1 episode "Your Real Best Friend!." Henry also explains to her what a villain (or "antagonist") is and how dull Action League Now! would be without them in the Season 3 episode "Money Train 2." Together, he and June explain the principle of the Accordion Squash in the Season 1 episode "Resistance is Futile," and the phrase "onomatopoeia" in the Season 3 episode "Your Logo Here!."
- A stock sound for Henry screaming was used several times throughout the series:
- Comics for Tomorrow Today!: When Henry tries to open a bag of potato sticks
- A Little Dab'll Do Ya!: Mr. Foot puts Henry through his armpit and when Henry tries to unclog Mr. Foot out of the toilet.
- Won't Stick to Most Dental Work!: On one of the flashback scenes from Your Real Best Friend! when Henry tries to escape a black widow's web.
- Won't Crack or Peel!: A hermit crab attacks Henry in its shell.
- Tastes Like Paper!: Henry and June trying to arm wrestle.
- I Just Don't Get It!: Henry being strangled by the Nutty Putty clone.
- Get Sam Donaldson's Mystery Bag: Henry getting whacked several times by June.
- Cramming Cartoons Since 1627: Henry tries to hold June's father who is fixing a studio light.