All names marked with a "*" have non-canon prefixes or non-canon suffixes in them. I advise against using those prefixes and suffixes if you are looking to make a fully canon Warriors fanfiction or fanfiction series.

StormClan

Leader:
Stormstar–white tom with light gray flecks and amber eyes

Deputy:
Goldenclaw–dark gray tom with yellow-stained claws and amber eyes

Medicine Cat:
Dewstorm–gray she-cat

Warriors:

Rainpelt–blue-gray tabby tom with dark blue eyes

Redfur–ginger she-cat with amber eyes

Blacktail–white she-cat with a black tail and amber eyes (Please keep in mind that Blacktail is a white cat with a black tail, not a fully black cat, as the story will refer to her pelt color later on.)
Apprentice:
Leafpaw

Thunderstrike–ginger tom *

Graywater–light gray she-cat

Gingerheart–ginger she-cat *

Mistyleaf–dark gray she-cat with green eyes

Apprentices:

Leafpaw–pale gray tom with blue eyes

MoonClan

Leader:
Moonstar–gray tabby she-cat *

Deputy:
Cloudpelt–white tom ** (** marks a name that was a canon name/found in the canon Warriors series)

Medicine Cat:
Lightfoot–black tom with white paws

Warriors:

Shiningheart–white she-cat with dark blue eyes *

Nightfang–white tom with two black fangs

Lilyleaf–gray she-cat with green eyes

Elders:
Duskflower–blind gray she-cat

DarkClan

Leader:
Darkstar–black tom with amber eyes
(Canon name)

Deputy:
Ashtail–dark gray she-cat
Apprentice:
Cinderpaw

Medicine Cat:
Eagletalon–dark brown tom

Warriors:

Smokewing–gray tom

Whitefoot–black she-cat with white paws
Apprentice:
Timberpaw

Sootface–dark brown tabby she-cat

Apprentices:

Cinderpaw–gray tom

Timberpaw–dark brown tabby tom

Elders:

Crowscar–black tom with a scar across his eye, blind in one eye

IceClan

Leader:
Icestar–white she-cat with dark blue eyes

Deputy:
Snowstorm–white she-cat with light blue eyes

Medicine Cat:
Frostpelt–gray and white she-cat with green eyes
Apprentice: Mintpaw

Warriors:

Frozenheart–white she-cat with amber eyes *

Blizzardwhisker–white tom with green eyes *
Apprentice:
Frostpaw

Coldspirit–black-and-white tom with scratches on his flank, former kittypet *

Whitebelly–black she-cat with a white belly *

Apprentices:

Mintpaw–white she-cat with green eyes

Frostpaw–white tom with black-and-white specks on pelt

Elders:

Blacknose–white she-cat with an unusual black nose

Cats Ouside of Clans

Icetail–white she-cat with light blue eyes; formerly from IceClan

Shadoweyes–white she-cat with black fur surrounding her eyes *

Oakpelt–dusty brown she-cat

Silverfur–black tom with silver around his jaw

Ottertail–dark brown tabby tom with a skinny tail

Nightfur–black she-cat with green eyes **

Leopardheart–golden tom with black specks