Mobile Suit Gundam 0079 Card Builder is what is known as an arcade trading game. Yes, that doesn’t sound particularly fun, but the game did feature some original characters introduced to the Gundam universe, and today’s cosplay features one of them, official game mascot Reiko Holinger (sans fierce rival Catharine Blitzen).
Designed by Mine Yoshizaki, Reiko Holinger is an all original character, drafted up to serve as one of the game mascots. Like any of the other game characters, she can take a role of secretary and interact with the player during gameplay, despite being a secret character that only appears much later on in the game.
Listed among Reiko’s hobbies are reading manga and playing video games. How apt. Oh, and apparently she also likes to ride bicycles.
The cosplayer tackling this colorful bodysuit is called Karin (III). I have no idea why the added Roman numerals (unless she just wants to make it easier for Googlers), but those aside, she pulls off a great depiction of Reiko.
Related Link: http://gundam.wikia.com/wiki/Reiko_Holinger