It is a matter of opinion, but Firestar is certainly one of the most well known characters in the Warriors series.
Yes he is cool! because he is so close to FireStar and his kin. (esspically SquirrelFlight and FireStar.)
Yes, because Pinestar's mother is Nutmeg and Jake(Firestar's father) is mates with her, they are quarter-brothers(Firestar is Nutmeg's son, whereas Tigerstar is Nutmeg's grandson). Cool, eh?
Firestar
They might be since Firestar's daughter, Squirrelflight, is Brambleclaw's mate.
He offered Firestar to sleep in his backyard for one night.
No . Firestar's kits are Leafkit/paw/pool, and Squirrelkit/paw/flight. Graystripe is Firestar's best friend and Silverstream was his mate.
this is an opinion to me it would be Firestar
No, Firestar isn't related to Graypool.
After Firestar dies? They will be atleast another three.
No, because Firestar is Squirrelpaw's father.
Yes, Firestar is in love with Sandstorm.
No, Firestar is not a book series. However, Firestar is one of the main characters in the Warriors Series by Erin Hunter.