RiverClan (1)
Leader: Velvetstar - she-cat (???).
Deputy: Waspvenom - tom (???).
Medicine Cat: Meadowmouse - she-cat (???).
Apprentice: Fallowfoot - she-cat (???).
Warriors:
Sagetail - tom (???).
Streamclaw - tom (???).
Leopardfur - long-legged light brown/golden she-cat with ivory stripes, white underbelly, paws, and amber eyes (Tigress10004).
Specklemoon - she-cat (???).
Bluepool - she-cat (???).
Fawnspot - she-cat (???).
Crak - tom (???).
Apprentices:
Harveypaw - tom (???).
Kits:
Cobrakit - ??? (???).
Rabbitkit - ??? (???).
(+ most likely more cats around)
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RiverClan (2)
Leader: Leopardstar - long-legged light brown/golden she-cat with ivory stripes, white underbelly, paws, and amber eyes (Tigress10004).
Deputy: Gorsewing - tom (???).
Medicine Cat: Fallowfoot - she-cat (???).
Warriors:
Harveyfire - tom (???).
Rabbitfang - tom (???).
Thrushfur - tom (???).
Fawnspot - she-cat (???).
Queens and Kits:
Cherryfoot - she-cat (???), nursing Gorsewing's kits Gingerkit, Frecklekit, and Greykit (???, ???, ???).
Specklemoon - she-cat (???), expecting Harveyfire's kits.
Elders:
Crak - tom (???).
Bluepool - she-cat (???).
Waspvenom - tom (???).
Brokenclaw - tom, formally known as Streamclaw (???).
(+ most likely more cats around)
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Additional Notes
Not the canon RiverClan! With how Tigress10004 is named Leopardfur/star, maybe she's a classic tabby? XD
The Animal Jam den both RiverClans took place in, as well as their terrain and territory, is unknown.