SunClan

This clan name is kind of overused. I like it (and used it in my earlier writing days) but sometimes it is overused.

 Sunthorn

Wouldn't she be Sunstar? Ah, it's cool. Sun- is overused, but adding the -thorn to it gives it a certain WOW factor. 

 MoonClan, DarkClan, LightClan

I like this! A theme! Like, LightClan and SunClan team up aginst MoonClan and DarkClan, or DarkClan and SunClan team up to kill the leaders of MoonClan and LightClan! XD

 Tall oak forest. Small pond in middle of territory where many herbs are found. A Teolegplace is to the north. A small but sizable river runs past camp, a good place to find moss and more herbs. A hot and sunny clearing is nearby camp as well. 

Try not to make your clan too perfect. Maybe add something like their territory floods often, that their prey runs only in summer , or that when it snows, the river freezes over, and it snows like, a foot? 

 ThunderClan prey and RiverClan prey.

So mice, birds, squirrels, fish, birds, voles, shrews, and more fish and birds and mice? 

Originally TreeClan. MoonClan was CinderClan, LightClan was BrightClan, and DarkClan was ShadeClan. A cat called Fearstar rose to power, and destroyed the Clans with an army of rogues. Four cats, one from each Clan, survived to defeat Fearstar. Their names were Sunthorn, Moonwhisper, Lightclaw, and Darktail. They found rogues, kittypets, anyone that would join the new Clans. They changed the warrior code and their culture in the hopes that nothing like that would happen again, but they failed. That fail by the name of Redstar.

Moonwhisper sounds like a Mary-Sue. Maybe change it to be like, Moonlight, Moonflame, Mooncloud, or Moonberry? Something not so Moonwhisper. 

 Shiningstar 

 Rosescar

 Barkfall

Isn't Barkfall cannon? Nice names though. 

 The largest Clan, egotistical, gets bad luck. Good at climbing, fishing, and attacking from above. Won't swim though  

Ha. Can't swim, but catch fish? I like this. They get bad luck often? Again, cool. They sound kind of like SkyClan, ThunderClan, and RiverClan mushed together. 

I give this clan a 9.4/10, and I say this because you should change Moonwhisper, add some bad territory, and look up Barkfall. 

Lilyfrost_Weirdo