Falconstar

Falconstar is the GravelClan leader who followed Smokestar. Since the deputy before him was killed by an antagonistic rogue group, Smokestar picked Falconsoar as a deputy due to his quick decision-making and combat ability. While he doesn't agree with Smokestar on everything, after her passing, he takes his job as leader very seriously. He appoints his mate, Brambleflower (eventually Bramblestar), as deputy. He threw himself in front of his clanmates whenever danger presented itself and put his medicine cats to the test with how often he would become injured. He lost his nine lives quickly for a leader, and Bramblestar took his place after his death.
Falconstar is actually the ThunderClan leader from my earliest Warriors fanfiction- he was originally called Peepstar but was later renamed.

Cats from this story:

GravelClan: Muddystar, Smokestar, Falconstar, Bramblestar, Ravenwing, Whitepelt, Fernleap, Ashtail, Daffodilspring, Twitcheyes, Crookedclaw, Seednose, Muddypool, Briarshore, Lizardclaw, Foxecho, Sootear, Squirreltail, Rainbowfur

CoastClan: Beachstar, Goldstar, Bloodpool, Heronstripe, Finchspots

MountainClan: Graystar, Mapleheart, Sparrowfeather, Rivershade, Silverblaze

CoyoteClan: Cranestar, Blackmask, Rowannose, Squirrelbriar, Cootbriar, Sleetberry, Slugcloud, Barleyear, Spidercloud, Pigeonheart, Nightpaw

Cats outside the clans: Shadescar, Ambernose, Cosmo