|Also Know As||Gwyn|
|Hair color||Pink (current)
|About friendship, interests and family|
|Enemies||Theo Merton Jr.
Luc Maxwell (one-sided)
|Love Interests||Luc Maxwell (one-sided)|
|Appearance and Voice actor|
|First episode||Theo Fly|
|Last episode||Part 2 of a Balanced Breakfast|
|Voiced by:||Denise Oliver|
Gwyneth "Gwyn" Sanders is a nerdy girl who Theo has a crush on. However, Gwyn doesn't fully like him and has a creepy, stalkerish crush on Luc, who also disgusts him and to call his attention, he can't stand to be around her. She is voiced by Denise Oliver.
Gwyn is a girl who goes to the same school as Luc and Theo. She is, in her own words, the best student in the whole town. She has a crush on Luc, but unfortunately the one who's interested in her is Theo.
She is very skinny and she has short pink bob hair with bangs and wears large square-rimmed glasses, yellow hairclips, light blue hoodie with number 8 in it, green shorts, socks and sandals.
Gwyn is a kooky, geeky girl, with not so many friends, but she's still peppy, cheery, and upbeat and goes through every Monday, and regular day, with a smile. She has very strong feelings for others, such as a stalkerish crush on Luc and a burning hatred for Theo.
- Theo Fly (Non-Speaking Cameo)
- She's All Bot
- All Things Being Sequel
- 4 Out of 5 Dentists Prefer the Loop (Cameo)
- Sickwich (Cameo)
- There's a New Principal in Town (Non-Speaking Cameo)
- Getted Smart (Non-Speaking Cameo)
- Fart Busters (Cameo)
- Applecrab-Dabra (Non-Speaking Cameo)
- The Replacement (Non-Speaking Cameo)
- Loop it Forward
- Chick Magnet
- Sooper Loopers (Non-Speaking)
- Port Fear
- Jan-Itor-Nado (Non-Speaking Cameo)
- Baby Daddy
- 11 Minutes to Lame
- Larping in the Loop (Mentioned)
- Ronnie Trasco
- Badmerton to the Bone (Non-Speaking Cameo)
- Loop - There it is
- Bald is Beautiful
- Out of Time
- Glitch Girl
- Her name is Kim in the German dub and Mylene in the French dub.
- Gwyn's creepy stalkerish crush on Luc is very similar to Kitty's crush on Eric from Sidekick.
- Her personality is also very similar to Kitty Ko from Sidekick.