He Co-Wrote Portal 2. Who Is His Favorite Character?Brian Ashcraft5/09/11 6:00amFiled to: SpoilersPortal 2PS3PCSteamValveerik wolpawXbox 360News169EditPromoteShare to KinjaToggle Conversation toolsGo to permalink Valve lead writer Erik Wolpaw lent his clever pen to sci-fi shooter Portal 2. If you've played the game (this post has spoilers!), you might have your favorite character. Wolpaw does.AdvertisementAccording to Wolpaw, his favorite character (co-writer Jay Pinkerton's, too) is Rick the Adventure Sphere, the jabbering AI sphere with a Texas twang."The problem with the adventure sphere, from a under-appreciation perspective, is that you kinda miss his best stuff unless you play the final battle a few times and leave yourself a bunch of time with him," Wolpaw told blog New World Notes. Wolpaw said "pretty much" all of his dialogue was written before hand, but voice actor Nolan North improvised some stuff in the recording studio.