Charlie resides in an ancient temple on the far side of the world and travels to Ooo by growing to a massive size and becoming intangible, then easily walking through the ocean with her upper half out in space. She is heavily into mysticism and Tarot cards, which she uses to read the nature of others. In "Daddy-Daughter Card Wars," she uses one of Jake's bones and a lock of Lady's hair to read her own future, which depicts her going through some periods of confusion and sadness, but ultimately winding up wise in her 90s. She then fused with this future version of herself, gaining the wisdom to realize she was treating her father badly. At some point, she may be destined to have a hybrid son she names "Gibbon."
Like her father, Charlie has the body and face of an orange/yellow English Bulldog with large, characteristic eyes. She has patches of pastel colors on her stomach and the lower part of her body. She also has a light-blonde tail and mane with a single white, sharply pointed horn. Charlie has fairly light-orange freckles on her cheeks.
As an "adult," Charlie no longer has a green bottom and now wears clothes regularly. Her tail has also grown longer. In "Apple Wedding," she wears a blue necklace, pink one shoulder dress, and purple shoes. In "Ocarina," she is seen wearing a blue T-shirt that slightly resembles a dress. Her hair has also grown slightly longer compared to her last episode. In "Daddy-Daughter Card Wars," her hair is pulled back in a ponytail with a blue barrette clipped on to her hair. In "The Invitation," she wears a stained blue shirt and olive green shorts.
Charlie has inherited father's shape-shifting abilities and her mother's ability to fly and teleport from one place to another. She can also transform into a super pup with her brothers and sisters.
Charlie can grow as large as she desires but still keeps her initial mass. As she grows, the density of her body becomes less, making her look invisible. She can grow so enormous that her body reaches outer space and can walk through the surface of Earth in seconds. She can also grow not only her body but also her clothes, bag or just anything on her. She is a skilled Tarot card reader, and has an understanding of how to read the future and see a person's essential nature through mystic rituals. Her abilities were so great, she was able to destroy the part of Jake's ultra competitive side that was keeping him from enjoying Card Wars. These skills apparently translate to playing Card Wars as well.
- Charlie's dancing in "Jake the Dad" imitates Jake's dancing in "Power Animal."
- Charlie's name is not a reference to Charlie the Unicorn.
- As with two of the other pups, her name is possibly a reference to Charlie and the Chocolate Factory, where three of the protagonists names were Charlie Bucket (Charlie), Violet Beauregarde (Viola), and Mike Teavee (TV).
- She carries T.V. while flying several times in "Jake the Dad."
- According to her father, Charlie and her siblings (excluding T.V.) all have their own apartments.
- Based on promotional artwork for "Apple Wedding," Charlie lives in a very messy apartment and does not want Jake to find out about it.
- This was confirmed in "The Invitation." However, it appears that Jake already knows about her apartment.
- She was the only puppy to not speak English for the longest time, until "Daddy-Daughter Card Wars," which was over two seasons ahead of "Jake the Dad." All the other pups spoke earlier.
- She is Steve Wolfhard's favorite pup.
- In "Apple Wedding," all of Charlie's fur is yellow, as opposed to it having multiple colors as seen in other episodes.
- She is able to grow to such a size that her atoms are so far apart you can see through her.
—"Jake the Dad"
아빠 몸체이동! [abba momche idong!]
—"Jake the Dad"
무지개 뱅! [mujigae baeng!]
—"Jake the Dad"