Kelsey is fairly short when compared to her friends Craig and J.P. She has peach skin, light red hair tied into a bun at the back of her head, and thick, dark red eyebrows. She also has Mortimer, a yellow and green bird that sits on her head most of the time.
Kelsey wears a blue-gray T-shirt with a heart on it, and also wears pink shorts. In the pilot, her shoes are green and have a white bottom, but in the series, she wears blue boots. She has a dark blue cape that she wears around her neck.
Kelsey is very dramatic, in that she often narrates her life in her head in a style akin to theater.
She likes reading, as shown in "The Final Book" and is very upset when she can't find the last book in her favorite series. Kelsey says she spent years reading the young adult series and threatens the librarian when he says he can't tell Kelsey who took the book she's looking for. Kelsey's stated she "doesn't do sci-fi." She was very agressive about finding her book.
- In "You're It", it is revealed that her father is the only parent for Kelsey. And considering Kelsey’s comment about being “half-orphan” in the episode “Kelsey Quest”, it’s to be assumed that her mother passed away, possibly when Kelsey was at a very young age.
- Kelsey is one of the only characters to be recast in the series, next to Earl Williams and Jessica Williams.
- In “The Invitation” Kelsey revealed the only dish she knew how to make was the Hungarian dish, Chicken Paprikash. This possibly means that Kelsey might be part Hungarian.
|1. "Itch To Explore":||Appears||7. "Sunday Clothes":||Appears|
|2. "You're It":||Appears||8. "Escape from Family Dinner":||Appears|
|3. "Jessica Goes to the Creek":||Appears||9. "Monster in the Garden":||Appears|
|4. "The Final Book":||Appears||10. "The Curse":||Appears|
|5. "Too Many Treasures":||Appears||11. "Dog Decider":||Appears|
|6. "Wildernessa":||Appears||12. "Bring Out Your Best":||Appears|
|Craig of the CreekCharacters in|
|Main characters||Craig Williams • J.P. • Kelsey • Mortimer|
|Supporting characters|| Williams family: Bernard Williams • Duane Williams • Earl Williams • Jessica Williams • Jojo Williams • Nicole Williams
Paul family: Laura Paul
Creek kids: 10 Speeds • Handlebarb • Horse Girls • Jason • Junk Lord • Kit • Paintball Mike • Sewer Kids • Stacks • The Elders • The Junior Forest Scouts • The Ninja Kids • The Paintballers • The Scratchless • The Witches of the Creek • Wildernessa & Cheesesticks