(Update: I've redone the Allegiances. Now they make more sense, at least to me.)
ALLEGIANCES
THUNDERCLAN
LEADER BIRCHSTAR-dark brown tabby tom with a scar above his right eye
DEPUTY DUSKPELT – pale gray she-cat.
MEDICINE CAT HERBFLOWER- pale tortoiseshell she cat
WARRIORS SMALLEAR- gray tom with very small ears.
PATCHPELT- small black-and-white tom.
APPRENTICE, RUNNINGPAW
ICESTORM- white she-cat with Ice Blue Eyes
TAWNYSPOTS - gray tom with tortoiseshell spots
BARKFUR- brown tom with one white paw
APPRENTICE, GOLDENPAW
SANDFUR - big dark brown tabby tom.
ROSETAIL- ginger she-cat
BLUEFUR - blue-gray she-cat, tinged with silver around her muzzle
APPRENTICE, DEWPAW
THISTLECLAW - dark tabby with broad shoulders
REDTAIL – small tortoiseshell tom with a distinctive ginger tail.
WHITESTORM- big white tom
LIONHEART- magnificent golden tabby tom with thick fur like a lion's mane
APPRENTICE, FROSTPAW
TIGERCLAW- big dark brown tabby tom with unusually long front claws
APPRENTICE, DARKPAW
LETCHFOOT - pale gray tom
WILLOWPELT - very pale gray she-cat with unusual blue eyes
APPRENTICES RUNNINGPAW- swift tabby tom
DARKPAW- sleek black-and-gray tabby tom
FROSTPAW- beautiful white coat and blue eyes
DEWPAW- blue-gray tom with green eyes
GOLDENPAW- pale ginger coat
QUEENS DAPPLETAIL- pretty tortoiseshell she cat with a lovely dappled coat. The Oldest Nursery Queen.
SPECKLETAIL- pale tabby
MOONPELT- black-and-white she-cat
BLOSSOMFUR – Tortoiseshell she-cat with Green Eyes.
ELDERS MAPLEFUR- drak brown tabby tom
CROWHEART- Dark gray tom, the Oldest Cat in ThunderClan
POPPYPELT – Tabby she-cat
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SHADOWCLAN
LEADER TAWNYSTAR- tortoiseshell tabby she-cat
DEPUTY RAGGEDPELT- dark brown tabby with ragged coat.
APPRENTICE, BROKENPAW
MEDICINE CAT YELLOWFANG- dark gray she-cat with a broad, flattened face.
WARRIORS ASHFUR - thin gray tom
GORSEFOOT- tabby tom
APPRENTICE, CLAWPAW
NIGHTPELT- black tom
APPRENTICE, BRIGHTPAW
CINDERFUR- thin gray tom
DAWNCLOUD- small tabby
APPRENTICE, BLACKPAW
STUMPYTAIL- brown tabby tom
QUEENS DARKFLOWER- dark gray she-cat
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WINDCLAN
LEADER MOORSTAR- tabby tom
DEPUTY GRASSPELT- thin gray tom. Formerly an Elder.
WARRIORS CROWFUR – Jet Black Tom.
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RIVERCLAN
LEADER RABBITSTAR - light gray tom with unusually long hind legs
DEPUTY CROOKEDJAW- a huge light-colored tabby with a twisted jaw.
MEDICINE CAT GULFPELT- blue-gray she-cat with ice blue eyes.
APPRENTICE, MUDFUR
WARRIORS REEDTAIL – Brown tom with green eyes.
OAKHEART- a reddish brown tom
LEOPARDFUR – unusually spotted golden tabby she-cat
WHITECLAW - A dark warrior
QUEENS GRAYPOOL – thin gray she-cat with patchy fur and a scarred muzzle.
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CATS OUTSIDE OF CLANS
MARSHMELLOW- friendly white kittypet living on the edge of the woods.
SHARPCLAW- black rogue. Formerly of ShadowClan.