GingerBright (or Bright Cookie in LINE Cookie Run) is a C-Grade or Common Cookie that was released with Cheese Drop. In LINE, she has the ability to earn more XP, while in OvenBreak she creates Candy Jellies at given intervals.
(LINE)She's half gingerbread, half brains. Running is one way out of a problem, but she can think of a gazillion other solutions. She's so smart she found a way to get extra XP every time.
(OvenBreak)Maybe the Witch thought GingerBrave seemed lonely all by himself, cause she baked GingerBright with the leftover dough from making GingerBrave. Sweet and bubbly GingerBright is full of life. But this smart Cookie clearly knows that it would be a bad idea to offer her lollipop to GingerBrave.
Bright Cookie, at the moment, is the best Cookie to use for XP Farming due to her combi with Wishing Star that increases XP Gain by an additional 30% for a total of 42%. This combi no longer works as of June 2016.
A good relay for Bright Cookie is either Ginger Claus with his 10% XP Bonus, or Pirate Cookie with his ability to run for very long distances.
When combined with Cheeseberry, this combo will give 40 Extra Energy, a high amount of energy for a C-grade cookie. With 140 Energy, Bright will have an energy amount comparable with A-grade or S-grade cookies. More energy means more XP. Adding the Extraordinary Limited Edition Cookie Comics or Angel Cookie's Rainbow Feather will make the cookie more powerful in farming and ability, respectively.
Overall the cookie is a weak starter, but can be used for overpowered XP farming.
Bright Cookie's name in Japanese is 陽気なクッキーちゃん, where 陽気 (youki) means "cheerful, merry".
Most Cookie names in Japanese end with クッキー (Cookie) much like their English counterparts. However, Bright Cookie's name is one of the exceptions. Her suffix ちゃん (~chan) is a diminutive suffix added to refer to those of equal or junior status, especially among young girls. The other exception is Brave Cookie.
Oddly enough, Apple Cookie does not have this suffix in her name despite looking considerably younger than Bright Cookie.