8 (9 in June)
2 (books 1-2)
#1, Kristy's Great Idea (mentioned)
FF Special #2, Graduation Day
Charlotte is described as pretty with chestnut hair, big dark eyes, and a dimple in her cheeks when she smiles. She doesn't think that she's pretty. In Mary Anne and the Little Princess her hair is once described as red.
Charlotte's the only child of Dr. Johanssen and Mr. Johanssen. It's mentioned in Mary Anne and the Secret in the Attic that one of Charlotte's great-grandparents was a Danish woman called Berit Marie Hjielholt Johanssen, who moved to Stoneybrook at some point of her life. A photograph shows that Berit had dimples similar to Charlotte's.
Charlotte used to be very shy. While she becomes more outgoing and makes more friends, she doesn't stop being sweet and bookish.
Stacey considers her a little sister. Charlotte's upset when Stacey moves back to New York and excited she comes back. When Charlotte's parents are away in Stacey and the Mystery of Stoneybrook, she stays over at Stacey's house. Charlotte gets very worried about Stacey after Stacey ends up in the hospital in Stacey's Emergency, and briefly becomes a hypochondriac.
In Little Miss Stoneybrook ...and Dawn, Claudia convinces Charlotte to enter the Little Miss Stoneybrook beauty pageant. Charlotte isn't enthusiastic about the idea due to her personality and to believing isn't pretty enough to win. She decides to memorize part of a story and act it out for the talent part. When pageant day comes, she gets scared, and leaves the stage during he contest. Claudia feels bad for pushing her into participating and and apologizes to her.
In Jessi's Gold Medal she doesn't want to be in the BSC mini-Olympics. Charlotte becomes the official sign-maker and wins the most creative award.
Charlotte's supposed to stay away from sweets. She had two cavities last time she was at the dentist. She had two silver fillings in her molars to prove it in Beware, Dawn.
She plays basketball (despite disliking it) with her friends in Claudia and the Little Liar. In the same book Charlotte is mentioned to keep a diary and will sometimes let Stacey read it.
- Stacey McGill
- Becca Ramsey
- Vanessa Pike
- Haley Braddock
- Sophie McCann
- Ellie Morris (second-grade best friend)
- Natalie Springer
- Danielle Roberts
- Theresa Bradley (Zuni pen pal)
- Valerie Namm
- A schnauzer named Carrot. Charlotte taught Carrot how to say his prayers, where he can rest his head on his paws.
- Books and reading; her favorite book is The Cricket in Times Square. She also loves to be read to.
- Her favorite snack is pretzels
- Her second favorite sitter is Claudia.
- She likes reading the newspaper, and usually reads the bad stories aloud.
- She liked Polly's fine candy.
- Polar bears
- Favorite TV show is The Cosby Show
- Spaghetti and meatballs is her favorite meal
- Favorite books are The Long Winter and Charlotte's Web.
- Fudge and has made fudge with Becca before.
- Jamie Newton
- Solving Mysteries
- Star Trek
- Sports and gym class
- Afraid of horses
- Swimming in Lakes
- She sometimes uses her mom's plastic surgical gloves as balloons.
- Charlotte wins third place in the science fair by testing plants and how they react to music.
- Member of the Kids Can Do Anything Club
- She writes the cheers for Kristy's Krushers' cheerleaders.
- Entered Carrot in a pet show.
- She skipped second grade, and was called teachers pet when she was seven.
- She is learning how dogs are affected by body language.
- The Johanssen family is Danish American with German cousins.
- She made a booth for the math fair with Haley.
- She went to Paris with her mom.
- She has a toy doctor set.
- Charlotte can play the piano
- Eventually picks up the guitar in Keep Out, Claudia!
- She wrote a short book called The Girl Who Moved Away which she gives to Stacey at her yard sale.
- In Kristy and the Cat Burglar, Charlotte went through her "Harriet the Spy" phase.
- In Kristy and the Sister War she had a crush on Linny Papadakis briefly.
- Claudia and the Phantom Phone Calls
- The Truth About Stacey
- Little Miss Stoneybrook ...and Dawn
- Stacey's Emergency
- Stacey vs. the BSC
- Baby-sitters' Summer Vacation
- Stacey and the Mystery Money
- Stacey and the Mystery of Stoneybrook