|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 skinny and she has short pink bob hair and wears large glasses, blue hoodie, 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.