This is Zynawarriors 's OC, Songpool.

Name: Songpool
I kinda feel like -pool is an overused suffix, but this is a pretty name, so it works. But what mother and father look at their kit and see Songkit?
Mother: Her name is Songkit.
Medicine cat: Why?
Mother: I dunno. Cuz I want her to have a beautiful name when she's a warrior and so she doesn't get a name like Whitefur.

Looks: snow white and gray striped pelt with sky blue eyes and gray striped tail
She seems pretty unique looking. I think sky blue eyes are too common among OCs, but I can understand that. They're pretty, so I wouldn't advise you to change that.

Personality: kind, sweet, soft spoken, brave, loyal, honest, compassionate, sarcastic (sometimes) and rarely bossy
I think she might need a few more flaws, because we don't need another Dovewing. XD And then there's that kind, sweet, and soft spoken medicine cliché. Otherwise, she seems like a pretty nice cat. Just add a bit more flaws to her personality. :3

Gender: she-cat
Because Songpool wouldn't really fit a tom. XD

Backstory: mother disowned her at two moons old, never knew her father, was bullied for being herself and a med. cat. Later in life became a good friend to Echoripple, a young she-cat who never found someone to love.
I have a few questions. Why did her mother disown her? Did her father die, or was he outside of the Clan? Why was she bullied for being herself and a medicine cat? Maybe develop her backstory a bit more, and I think it'd be pretty good.

Extra: can sense feelings
Another medicine cat thing. I wouldn't necessarily say it's a cliché, but it's up there. Y'know, Yellowfang could sense other cat's feelings. Many people would discriminate Songpool for having a power, but I don't see anything wrong with that, unless the OC becomes a total Maru Su.

Cause of death: none still alive
Haven't put much thought into it, eh? Well, just remember, she can't live forever. Don't make her like Graystripe and Sandstorm. I swear, those two are on cat steroids...

Mate: none
Duh. She's a medicine cat. And the forbidden love thing for the med cats is a little overused.

Kits: none
Don't want those pesky little things? Lol, I'm just kidding.

Clan: ThunderClan
Of course, the Clan of heroes.

Rank: med cat
Thank you. I honestly think people need more medicine cat OCs.

Afterlife: not either since is still alive
She probably would go to StarClan, though.

Overall rating: 8.5/10
I think she's a pretty well-developed character. Maybe just explain the backstory better, and giver her a few more flaws. Anyways, good character!