So, I decided to do a "what if?" allegiances thing where Tigerstar kills Firestar (don't kill me!) before BloodClan attacks. This is basically what it would be like if Firestar lost. I'm not promising that I'll write a fanfiction to go along with this. This is just an experiment.
First Arc
Allegiances
Leaders-Tigerstar- big dark tabby tom, unusually long front claws
Darkstar- sleek black-and-gray tabby tom
Leopardstar- unusually spotted golden tabby she-cat
Mudstar- mottled dark brown tom
Deputies: Blackfoot- white tom with large, jet-black paws
Longtail- pale tabby tom, dark black stripes
Heavystep- thickset tabby tom
Apprentice- Dawnpaw
Tornear- tabby tom
Medicine Cats: Runningnose- small gray-and-white tom
Apprentice- Littlecloud
Mudfur- longhaired light brown tom
Barkface- short-tailed brown tom
Warriors: Oakfur- small brown tom
Apprentice- Tawnypaw
Russetfur- dark ginger she-cat
Apprentice- Cedarpaw
Jaggedtooh- huge tabby tom
Apprentice- Rowanpaw
Blackclaw- smoky black tom
Apprentice- Bramblepaw
Shadepelt- very dark gray she-cat
Loudbelly- dark brown tom
Thornclaw- golden-brown tabby tom
Frostfur - white she-cat with blue eyes
Goldenflower- pale ginger she-cat
Webfoot-dark gray tabby tom
Apprentice- Ashpaw
Runningbrook- light gray tabby she-cat
Apprentices: Ashpaw- gray tom with darker flecks
Bramblepaw- dark tabby tom with amber eyes
Tawnypaw- tortoiseshellshe-cat with green eyes
Cedarpaw- dark gray tom
Rowanpaw- ginger tom
Dawnpaw- pale ginger she-cat
Queens: Tallpoppy- long-legged light brown tabby she-cat
Willowpelt- very pale gray she-cat with blue eyes
Kits- Rainkit, Sorrelkit, and Sootkit
Mosspelt- tortoiseshell she-cat
Ashfoot- gray she-cat
Morningflower- tortoiseshell queen
Whitetail- small white she-cat
Elders: Smallear- gray tom with very small ears
Dappletail- once-pretty tortoiseshell she-cat, lovely dappled coat
One-Eye- pale gray she-cat, the oldest cat in TigerClan
Speckletail- pale tabby
BloodClan
Leader: Scourge- small black tom with one white paw
Deputy: Bone- massive black-and-white tom
Claws: Ice- white and silver she-cat with gray eyes
Peanut- brown tabby tom
Midnight- black tom
Jill- brown she-cat with ginger splotches
Smokey- dark gray tom with dark amber eyes
Lizzie- yellow and orange she-cat
Nursing Mothers: Jade- dark red she-cat with green eyes
Kits- Flower and Rain
Cats outside of TigerClan/ FireClan
Leader: Whitestar- Handsome ginger tom
Deputy: Graystripe- long-haired gray tom
Apprentice- Stormpaw
Medicine Cat: Cinderpelt- dark gray she-cat with blue eyes
Warriors: Mousefur- small dusky-brown she-cat
Mistyfoot- dark gray she-cat with blue eyes
Apprentice- Featherpaw
Ravenpaw- black tom with a white tail-tip
Cloudtail- longhaired white tom
Onewhisker- brown tabby tom
Apprentice- Fernpaw
Dustpelt- dark brown tabby tom
Brackenfur- golden brown tabby tom
Apprentices: Fernpaw- pale gray (with darker flecks) she-cat with green eyes
Featherpaw- light gray she-cat with blue eyes
Stormpaw- dark gray tom with gray eyes
Queens: Brightheart- white she-cat with ginger splotches
Sandstorm- pale ginger she-cat
Elders: Barley- black and white tom, formerly a loner.
