June has robin’s egg blue hair in a ponytail with spikey bangs, and is most often seen wearing a yellow t-shirt with a red-orange jacket with black spots, and green plaid shorts, a smelly white socks, and purple shoes (sometimes shown as cleats). In a couple of episodes, it is revealed that she wears a white sleeveless undershirt under her tee and jacket, and one episode even shows her underwear: bloomers that match her jacket.
June's characterization and personality changed significantly between Seasons 1 and 2. In Season 1, she is depicted as overly excited, ditzy, and not too bright. In Seasons 2-4, however, she is depicted as smart, prone to snarky remarks, and laid-back, but with a rather fiery temper. This change in characterization was very well received by fans.
One of June's most consistent traits is that she's a prankster, and often teases Henry. Usually, she's laughing at him because he always gets hurt.
June has a number of skills. She is often shown to be quite proficient with machines and gadgets, and built a large and complex page-turning device. She can also play the acoustic guitar and sing.
Relationship with Henry
Even though they frequently bicker (and he often ends up at the receiving end of her jokes), Henry and June are very close friends. There have been threats to their bond - most notably in the episode Won't Stick to Most Dental Work, in which Henry got tired of being made fun of and left - but they always ended up back together in the end. In the unaired series finale, June kisses Henry on live tv.
June seems to be the most popular character among fans, for numerous reasons. One is that her sense of humor is a bit more "adult", endearing her to older fans. Another is her originality - while most other animated shows have female characters in more generic "girly" roles, June is a tough-talking tomboy. Another reason is that many fans simply find her cute.
June teaches about choking and the Heimlich maneuver in the Season 3 episode More Happiness than Allowed By Law, where she lets Henry choke on the wedding cake just as she teaches. Together, her and Henry 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".