This Oc belongs to WindstreakRosefoot

Name: Kestrel
Nice

Past names: Swiftkit, Swiftpaw
Interesting...

Future names: Kestrelflight
Hm, so her name changed but she kept the loner prefix with her Warrior name

Name reason: this is just for Kestrel: she changed her name to Kestrel after she left SunClan because she felt that it represented her new freedom. She is also brave and stubborn, which reminds her of a kestrel.
Oh, that's nice. I think it's funny how she completely changed her name instead of just keeping Swiftpaw or going by Swift

Appearance: she is white with cream and pale brown markings, and her eyes are a vivid amber.
LOVE IT. Mind if I steal? 😏
She is quite thin as when she first became a rogue she wasn't used to hunting by herself and she has only recently got the hang of it.
Makes sense, but also I imagine her as slim framed in general
It is also partly because, to avoid patrols, she moved far away from the Clan and so she can't always find enough prey
Ah, well that kind of sucks. Also, I know this isn't included, but I imagine she has thin fur with 0 floof 😆
She also has lots of small scars and there are often leaves and twigs clinging to her pelt.
I really, really like this detail for some reason

Gender: Female
*tips hat*

Age: about thirty moons, she doesn't know her exact age (it is 34 moons actually. But she's close enough with her guess.)
I like that she even keeps track of her age 😂 Come to think of it, I'm pretty sure most Warrior cats don't know their age past 15 or so.

I think her age is also fitting for the character

Personality: Kestrel is fierce, stubborn and strong-willed. She does not like listening to authority, and she likes to be allowed to run and roam where she wants to. This is part of the reason that she left SunClan. She often gets into trouble because of these traits.
Wow, her personality makes complete sense with becoming a rogue. I have to wonder though, why does she join back one day?

It could also be longer but it's fine as it is

Clan: she is a rogue, but she was born in SunClan and in the future she will join BirchClan.
Ohhhhh, okay so not SunClan

(GUESS WHO JUST FIGURED OUT HOW TO SAY "OH" INSTEAD OF "OOH" IN TEXT)

I am disappointed though that there's isn't a description of Sunclan or BirchClan :/

Rank: she is a rogue.
Obviously~ *hair flip*

Kin: mother (Softwing): a white she-cat with brown eyes and extremely soft fur.
Ok, cute but I think soft furred she-cat named Soft is kind of cliche
She is gentle and kind, and she is naturally thin. However, her fur can make her look fat.
Like a husky! (When the summer comes around 0-0)
Nobody knows who her father is, not even me.
It's fine if she doesn't know who the father is, but Softwing should ABSOLUTELY KNOW WHO IT IS UNLESS SHE HAD AN ORGY AT SOME POINT.

I'm just saying, always flesh your characters out completely. I don't care if
Orgy-organizer100_sexyBEAST never shows up in the story. I still wanna know who he is. Softwing should at least know what he looks like! (Again, unless the orgy happened)

Half-brother (Tigerpaw): a dark ginger tom with amber eyes and black markings.
His appearance is kind of meh. To me, it just seems really generic that he looks like a tiger. Also, you can make his character more interesting and the description more detailed by adding other colors, markings, and features.

Also, who is dad? 👀 EVEN IF HE DONT KNOW YOU HAVE TOO
(Seriously, Softwing needs to get her 💩 together if she doesn't know this one either)

He is strong but does not like to harm other living things.
That last line sounds kind of stupid no offense 😂 Does he he feel bad for stepping on flowers? Is killing prey unjust and warriors should be vEgeTaRiaNS?

Ok, I'm taking this too seriously but you should probably change it to something like "prefers not to fight other cats". "Other living things is way too broad of a category, unless he actually feels bad for prey and flowers.

Sister: Lilyheart: a white she-cat with green eyes. She is elegant and seems perfect.
Hm, kind of a boring description. I guess the white reflects that she seems perfect, whereas the cream and brown in Kestrel's pelt could reflect her rough-and-tumble personality (like dirt on her pelt), so I guess the white is fine. But the description could be more detailed!

Crush: she lives alone, she doesn't have a crush.
Makes sense

Mate: see crush
Classy

Kits: see mate
dOubLe classy

Friends: First off, I thought she lived alone? How does she have friends if she's completely alone. Unless she met them briefly and they're nomads, or they're Kittypets

Ash: a black and dark grey she-cat with green eyes
The name Ash with a black and gray Description is something I've seen a lot, so you might wanna change it, or add more detail so she's set apart from other Ocs like her

Rain: a grey and white she-cat with amber eyes
I actually really like Rain... I think something about certain descriptions is just immediately forming a clear picture in my mind XD But she also needs more detail, so I'll give you an example of how I imagine her

"Rain- A small white she-cat with pale blue-gray spotted tabby patches, and bright amber eyes"

You don't have to go with this, but it's here if you want to use it :)

Backstory: Kestrel was born in SunClan as Swiftkit.
Yup.

At first she loved the life, but as she got older she felt pinned down by all the responsibilities and her perfect sister, Lilyheart, who was actually quite cruel to her.
Oh, why was Lily(paw?) mean to her?

When Swiftkit became an apprentice (Swiftpaw), she started planning to run away.
Damn, it must've been really hard if she wanted to run away as an apprentice.

She waited patiently, although it was hard, and a few days before she was going to become a warrior she crept away into the nearby forest.
Ok, so she left at a Warrior age

She struggled to survive at first as she was used to different prey, but eventually she got used to life outside the Clans
I would've liked to know what kind of territory she settled on that would have different prey, and what happened in the moons she wasn't part of the clan.

Review: Wow, I have no idea how to start these anymore. Welp, we're just gonna jump right in.
Kestrel is overall, what I would consider to be a good Oc. She has a nice appearance, age, and personality, but still has room to grow. For example, her personality could be expanded on, and so could the kin (this part is URGENT). Ok, back to the Kin (this might be my personal preference) I think it's good to map out most of the family tree and who mentors/friends are so you have a really good grasp on the character. Anyways, the backstory is my biggest problem because it's short and not very detailed. I want to know why her sister was mean to her, how she was mean to her (putting fire ants in her nest, etc.), any fights they had, who her mentor was, what there relationship was, any other apprentices she could be friends with, and other things you could add to the backstory. I also want to know exactly what kind of territory she lived on, what she ate, where she settled down to live (unless she's a nomad), and how she met the cats listed in "Friends". Other than that though, she's a great Oc! I think you should continue her backstory until her death since she somehow ends up in BirchClan as Kestrelflight, as you mentioned it in "Future Names". Also, I wonder if SunClan and BirchClan are neighbors...? Anyways, hope you liked my advice! :3