The Sewer Queen has black hair and brown skin. She wears swim goggles, a dark blue shirt, and light blue swimming shorts. Like many of the other Sewer Kids, she's always barefoot. She has syndactyly; her second and third toes are webbed on both of her feet.
At home she lets her hair down, wears a blue t-shirt over her turquoise swimming shorts and wears glasses.
She comes from a family of Filipino immigrants, first revealed in "Afterschool Snackdown" when she mentions "whenever my mom goes back home to the Philippines".
In "Sink or Swim Team", it is revealed her family comes from Cebu, located at the Visayas region of the Philippines, as her grandmother is only able to speak in Cebuano. Eileen herself does not know how to speak the language very well, but is still able to understand and make conversations with her grandmother. This is a trait common for many children of immigrants.
The Sewer Queen is a strong leader, happily encouraging her subjects and helping them with their problems. It was these traits that gave her the loyalty of her subjects to begin with: seeking out a way to cool off without the eye of public pools, she cleared out the sewers to make a place where she and her friends could play.
The Sewer Queen has a deep reverence for the sewers she presides over, calling its waters "sacred".
The Sewer Queen carries a pool skimmer net with her. It is primarily used as a walking stick, similar to Craig's staff.
Her subjects use various water-based toys as weapons, such as pool noodles and water guns.
|1. "The Legend of the Library":||Non-speaking||21. "The Champion's Hike":||Absent|
|2. "Locked Out Cold":||Absent||22. "Bored Games":||Absent|
|3. "Beyond the Overpass":||Absent||23. "Scoutguest":||Absent|
|4. "Sink or Swim Team":||Appears||24. "My Stare Lady":||Absent|
|5. "The Quick Name":||Absent||25. "Silver Fist Returns":||Absent|
|6. "The Chef's Challenge":||Absent|
|7. "The Sparkle Solution":||Absent|
|8. "Better Than You":||Absent|
|9. "The Dream Team":||Absent|
|10. "Fire & Ice":||Absent|
|11. "Chrono Moss":||Absent|
|12. "In Search of Lore":||Absent|
|13. "Opposite Day":||Absent|
|14. "Adventures in Baby Casino":||Absent|
|15. "Creek Talent Extravaganza":||Cameo|
|16. "Dodgy Decisions":||Absent|
|17. "Hyde & Zeke":||Absent|
|18. "The Anniversary Box":||Absent|
|19. "Lost & Found":||Absent|
|20. "Grandma Smugglers":||Absent|
|1. "Craig of the Car":||Absent|
|2. "How Was Your Day?":||Absent|
|3. "The Williams Family Opening Theme Song":||Absent|
|4. "How to Map the Creek":||Absent|
|5. "Creek Kid Rap":||Appears|