This Oc belongs to 

---------

Name: Applerose
Pretty!

Past names: Applekit and Applepaw

Name Reason:

Apple: long story short she is based off my cat apple but in the clan it's probably because of her pelt.
Ok

Rose: because she is kind but can be mean.
?? This part definitely doesn't make sense, if you want it to be for her personality Rose could mean she's sweet and gentle. If there's another meaning here you need to explain it more, because it's not obvious.

Edit: Actually, after thinking about it for a bit I think you might've been trying to use Rose's soft petals and sweet smell contrasting with their thorns as a metaphor for her, but it still should be explained.

Appearance- A small, long furred, black she-cat with orange and White spots. Her dainty little paws are white and her tip of her tail is white too. She has gorgeous amber eyes.
Sorry, but "dainty little paws" sounds like baby talk I would do to my actual cat. I think I get what you were going for with the eyes, but that and using "gorgeous" has a cringe vibe. I like that she's mostly black though, that's interesting.

Gender: female
Ah-ah-ah, her age is missing.

Personality: motherly, kind, friendly, but can be overprotective of her kits, she doesn't like to fight but will if she needs to, has a soft spot for kits, she can be a tough mother if it for her kits safety, Can get playful, smart, and caring.
Tbh I'm already bored. This is a very common personality, I don't feel like I know how your character would act in general- most of the stuff described seems to be about kits. I also don't see any flaws listed.

Sexuality: straight

Clan: Lightningclan. They eat Voles, birds, sometimes fish, squirrels, rabbits, and moles. Ok, so this is a different time line then canon Warriors what if after the clans left the Forest the twolegs stopped construction? And a few years later the Forest when back to normal which 5 cats started the new clan one of them being Lightning (later Lightningstar and leader of lightningclan) a kittypet took the old Thunderclan territory and made a new clan to live there Lightningclan! They follow the warrior code but medicine cats can have kits/mates.
I would say LightningClan is completely useless. You might as well just use ThunderClan under a different leader, and say he changed the medicine cat rule. Also the construction thing doesn't make sense, so it can just be an alternate universe where that never happened or something.

Rank- warrior

Kin:

Mother: little mama: an small, orange tabby she-cat with White paws, a white chest, underbelly, and tip tail. She has green eyes.
Okay, I'm sure some people out there actually name their cats like this but THAT DOESNT MEAN I DONT HATE IT.

Father- Samba: a big, black tom cat with a white chest and amber eyes.

Brother: Liontail: a small, orange tabby tom with amber eyes.
All the family appearances make sense but need a little more detail.

Sisters:

Nightkit: a black she-kit

Moonkit: a gray she-kit
That seems almost exactly like Tigerkit's littermates, except Mistkit is Moonkit here.

Mate- Spottednight: a black and white tuxedo tom with green eyes.
Makes me think of Spottedshadow from Tennelleflowers lol.

Kits: Marshpelt: a little, Calico transgender tom with green eyes.

Cinnamonfur: (um) a brown tabby she-cat with cheetah spots on her paws, green eyes, white paws and tip tail and muzzle.
Nope, get rid of cheetah spots. Just say she has freckles or something. Also what's up with the "um"? I also just realized her appearance is pretty similar to the canon Cinnamontail.

Mentor- Lightningstar: a black and white tuxedo tom with amber eyes, white tip tail and muzzle.
Very cliché that the leader is her mentor.

Apprentices- none

Friends: there is too many to label them all but her brother is her best friend
You should at least write down her main friend group.

Backstory- applekit was born a 4 moons after the new leader of the clan got  his nine lives so applekit, her sisters and her brother were the first kits in the Clan until they were 1 moon old
First thing that stands out to me is the grammar. You should really write up a cleaner version with proper capitalization and punctuation, because bad grammar is very distracting and makes a character seem less serious.

Anyways, I guess this is set right after the creation of a new clan, which I'm gonna be honest, I absolutely hate those stories. They always seem to have the same vibe and clichés and are very annoying to read. Also since both of Apple and Lion's parents aren't clanborn, there should be a little information explaining what's going on.

Thunderpelt had her kits, Stormkit, flowerkit, squirrelkit, and Sunkit. They were all friends but stormkit was hard to get along with. But after applekit was 2 moons old Moonkit got sick and Died two days after that Nightkit went missing in the middle of the night never to be seen again.
Nightkit should just get sick with Moonkit, the whole going missing thing is pointless.

This hit applekit and lionkit hard and they never fully recovered from this.
I bet we'll never hear how this affects there lives ever again.

Nothing really happened until applekit became an apprentice and got Lightningstar as her mentor finally her life was getting better. But it was only getting worse. First her dad got hit by and monster then her mom got killed by a fox. At this time she relied heavily upon jer friends who were now apprentices and brother. But soon there was a big flood and all of the clans had to move into lillyclan camp when that happened Stormpaw fell in love with a LilyClan she-cat named Skypaw. When they were in lilyclan camp a Lightningclan queen named Whiskerfrost had two kits named Spottedkit and Brookkit. After one moon of staying at lilyclan camp all the clans left but not before Zanestar declared war(for no reason) on lillystar
Ok, pause here. This is extremely rushed and confusing. This is getting even more cliché, as everything horrible is happening to her and it's very "woe is me, I'm the Main Character". I think her parents dying should just be left out and they died with her sisters from sickness or something earlier in the story. Stormpaw can still fall in love with Skypaw, but maybe LightningClan doesn't actually go stay with LilyClan, and the other leader declares war on LilyClan because they are actually doing something wrong, which gives more conflict to Sky/Storm and a reason for Apple to dissaprove.

. But Stormpaw decided to stay with Skypaw in lilyclan. Things when back to almost normal and Applepaw and lionpaw got their warrior names AppleRose and Liontail. A moon after that Flowerpaw, Squirrelpaw, and Sunpaw got their warrior names Flowerfield, SquirrelRipple, and Sunshine. Nothing much happened for the next 8 moons but Spottedkit and Brookkit became apprentices too Thunderpelt(the deputy) and Darkflame. A few days after they became Warriors Stormpaw now Stormcloud and Skypaw now Skybranch joined Lightningclan only to discover Skybranch was expecting Stormcloud's kits.
Wait, so you're telling me a war was declared but led to nothing and none of the story was affected by it at all? Why is it even in here then. And kind of weird that Storm and Sky would come back to LightningClan, but I'll let it slide, could have potentially interesting reasoning.

A few moons later  Spottedpaw and Brookpaw became Warriors named Spottednight and BrookSpring. This is when applerose found herself starting to fall for Spottednight.
Wait, I'm kind of concerned. How much younger is Spottednight than Applerose.

Two moons later Skybranch had three kits named Sandykit, Rainkit, and Pricklekit. Soon AppleRose and Spottednight became mates. But in the middle of leaf-bare a brown tabby she-cat kittypet joined the clan and her name was Rosey. Rosey and AppleRose quickly became friends. Rosey became liontail's mate. Later in the early new-leaf AppleRose found out that she was going to have kits.
Rosey didn't even appear in friends-

Little did she know that these kits would change her life. In the middle of green-leaf she had two beautiful she-kits named Marshkit and Cinnamonkit. She loved them and spent most of her time with them. Soon they became apprentices. But on one leaf-fall day Marshpaw told her mother that she was transgender. At first AppleRose didn't understand why Marshpaw wanted to treated like a tom. Marshpaw had always been a tomboy but she never had shown to much interest in being one. But after after a few moons AppleRose accepted Marshpaw now Marshpelt as a tom.
I feel like in warrior cats there really isn't a distinction at all between "tom" activities and "molly" activities, so the tomboy thing doesn't really make sense to me. Otherwise it's fine, but what about Spottednight? He's the father so I'd like to hear his thoughts too.

Other- most of these cats are based off my irl cats.
Cool! I like doing that too.

Review:

Appearance/Personality:
The appearances were all fine, but to me they were all kind of lackluster, which probably has to do with the simplistic words and lack of detail. Add more descriptive language and get rid of some of the cringey words (i.e "gorgeous", "dainty") and I think you're good to go! Also get rid of the cheetah spots mentioned on Cinnamonfur. She can have freckles and/or be a spotted tabby, but the cheetah spots don't make sense.

For her personality, I think it's really basic and boring. One thing that struck me as odd is that a lot of her personality seemed to revolve around her kits, even though she wouldn't have had those for a while, so she should have an established personality before that. She also didn't have any flaws or any negative traits, so definitely add in those. Personally, one of the things I find helpful for figuring out a character's personality is writing their relationships and feelings towards other characters first. I don't know why, but it helps me flesh out the vague idea for their personality I had without feeling pressured by "officially" writing it out. So, yeah, try that for Applerose or do whatever helps you, just flesh out her personality more and make her less centered on kits.

Backstory:
The backstory was really under-detailed, to the point where most of the events were confusing and seemed unnecessary. You really need to add more exposition at the beginning of the story to help the reader understand why her parents joined the clan and set up her and her siblings birth. I also want there to be a little bit on her friends mother, Thunderpelt, because her and her kits introduction felt very sudden. Then the thing with the flood and moving to LilyClan, I actually really like, but the war thing needs to be ditched unless it's going to be an actual plot point. After that when Stormcloud and Skybranch come back to LightningClan, I want to know WHY and have some actual reasoning. And also see everyone's reaction, and if they struggled to come back or Lightningstar was just like "That's cool lol". Then randomly Rosey shows up, which again, is very sudden. Take more time introducing characters and developing their relationships with others, especially if they're going to be mates. Which is another point I have with Apple and Spotted. First of all I'm not that sure what their age gap is, but since he was born when she was an apprentice it must be somewhere around 6-10 Moons. Which isn't horrendous, but it seems like they get together pretty young... ANYWAYS. My point was that there wasn't any development for them. It was just "and then they became mates and had children." like... okay? I want to know and care about these characters, but with so little detail it's hard to. For her two kids, they're fine. I don't have much to say about them at all, it's not exciting, but not bad either. And my last point; Fix. The. Grammar. You really, really need to clean up the spelling and punctuation on this form, it's very untidy and hard to read, which is both annoying and unprofessional.

Lastly, (this is to short to get it's own section) I wanted to mention again that LightningClan is pretty pointless, and you should just use ThunderClan for the setting.

Overall, Applerose is a pretty okay Oc! She's certainly not offensive, but could do with some tweaking.

Sorry this was a bit short, I just didn't have that much to say this time!

I hope you enjoyed it~ Gin