A disaffected nerdy-but-stylin' girl with a slightly retro fashion-sense. Black-framed glasses and short dark hair common. Never blonde.
Marcie from Peanuts and Velma from Scooby Doo can be considered precursors to the Enid archetype.
Also the name of beautiful girls, tall, blonde and light eyes. Have nice body with curves.
Sailor #1- I don't know where to go anymore.
Sailor #2- Follow the Enid and the Rigel and we'll get there.
Boy #1: What's her name?
Boy #2: Enid, I think, she's new this year.
Boy#1: Dayum! That explains why she's so hot.
-"You know what that means?"
"Yeah, she's gonna bitch me out, then give me head later"
"Omg! My new boyfriend is SO cute, did you see him?"
-"Not yet, but don't tell Enid!"