*Elisabeth Olivia "Sissy" Blakley is one of Johnny's classmates and serves as his romantic rival.

Sissy is a girl who is the rival of Johnny and claims to be smarter than him. Though Sissy has fun bullying and teasing Johnny, she is implied to actually harbor romantic feelings for him (which may or may not be mutual).

Sissy has pale-white skin, and waist-length long blonde hair held back in a ponytail with bangs straight up and a red lightning bolt shaped streak covered by a red plaid bandana. She has multiple ear piercings, and big blue eyes with extremely long black eyelashes, a black choker and pink lipstick. Her normal attire consists of a black t-shirt with a blue camisole under with a red plaid skirt over jeans with two crisscrossed white belts and black and white checkerboard print sneakers. Her eyebrows are very thin and maybe drawn on. She also has two black bracelets on each wrists.

She has worn a ladybird scout uniform consisting of a green skirt, a green polo shirt with a pink bolo tie, a green beret dress with a pink upside down triangle with an acorn in the center. She also sports a badge sash across that has a large amount of badges on it.

In Johnny Dodgeball, Sissy, being a pro dodge ball player, has a standard uniform consisting of a yellow shirt and shorts with red outlines along with gray sneakers.

When Johnny and Dukey get shrunk down to more than microscopic size and are sent to a alternate universe, the Sissy there appears the same but has red hair and the lightning bolt is blond.*