The squirrel-like Green Lantern is not identified by name, but his physical appearance and sector number are consistent with the Green Lantern Ch'p from the comic books. According to the producers, the character was initially supposed to be Ch'p's successor from the comic books, B'dg, who has more of an alien-like appearance. The design of the character eventually changed to a cuter, more squirrel-like appearance, which was more consistent with the character of Ch'p.
There is a blurred figure (but distinct enough to be seen bearing horns) that flies by Kilowog when Hal tries to recruit him. This figure can be identified to be the Green Lantern Ke'Haan.