Greystripe is a warrior in ThunderClan and is one of the many love interests of Stargleamstar.
Greystripe first appears in Chapter Four in which he asks Starpaw to be his mate, which she accepts. However, Firestar wakes up and fights him, because he wants to be Starpaw's mate. Starpaw runs off shortly after.
He is then mentioned briefly before the leader ceremony for Stargleam and in the epilogue where Firestar and him seemed to have resolved the argument.
Greystripe is a dark grey tom with a darker grey stripe running down his back.