For @JazzyLegend. Next oc will be Coldstar.

Name: Silentjay

This is cool. I never really liked Silent- as a name, but the -jay makes this very unique. You very rarely see jay as a suffix.

Gender: She-cat

Of course...

Appearance: silvery white she-cat with gray eyes, white underbelly, black paws and a scarred shoulder

Silvery gray is pretty common. I'm surprised she isn't a tabby though, good job on that. Gray eyes aren't very common. The scarred shoulder was a nice thing to add, I like that!

Age: 38 moons (3 years)

Not too old, not too young. Good job.

Clan: EchoClan

Echo is used a lot, but I like EchoClan. It's short and simple.

Rank: Warrior

Okay :3

Personality: clever, sharp-tongued, gentle, and somewhat arrogant. She sometimes says things she wishes she didn't.

Nice! She has flaws. That's really good. I like this personality, you don't see this too often in ocs.

Backstory:
As a kit, she was loud and talkative, same with her apprentice moons. Shortly after becoming a Warrior, she meets a pretty kittypet named Nyx who she befriends quickly. Nyx asks to join EchoClan in fear of her housefolk taking her unborn kits away. Nyx's mate, Zerio, also asks. Zerio is killed protecting the she-cats from a dog. Not too long afterward, about a half moon, GroveClan attacks EchoClan for territory. Nyx and her unborn kits are killed by the GroveClan deputy. After this happens, Silentjay strays from her old self. She meets a tom, Reedwhistle, who is the medicine cat apprentice for GroveClan and the two fall in love. She soon discovers she's expecting his kits and flees EchoClan, only to go back with the guidance of Nyx. She gives birth and nearly dies doing so. Cats assume the father is Cedarfall, another EchoClan warrior. Although the two cats mostly avoided each other. Later, however, due to the rumors, the two cats do form a bond and become mates, having their first litter of kits together.

I like this. The forbidden love is a cliche, but you wrote it right. You made it interesting. I did not expect Nyx to die, that made me sad :( It was also unexpected for her to fall in love with Cedarfall. Good job on this.

Mate: Reedwhistle(formally), Cedarfall.

I don't really like -whistle, but it's cool.

Kits:
First litter; Nettlekit(deceased) Cinderfrost, Pidgeonwing and Trouttail.

Ayy, I have an oc named Cinderfrost. You don't see these names often, I like them.

Second litter; Kestralpaw, Nightpaw, and Shimmerpaw

Nice. Night- is overused, but other than that, I like this.

·~*OVERALL*~·
9/10! Good job! Silent- is just an odd prefix, and it really doesn't make any sense for this cat. You also used a cliche in her backstory, and even tho it was good, it's still... cliche. Other than that, this is great.