Series: Warriors. Nice, seeing a OC from my favorite series seems exciting to rate!
Name: Berryspark. Pretty nice name. 'Berry' and 'spark' together makes a very good name!
Rank: Leader. Wow that's a highest rank!
Age: Unknown. C'mon! Ages help me know if your OC is young or old.
Gender: Tom. That fits him.
Clan: LightClan. That's a cool and interesting name of a clan.
Appearance: A white Tom with silver patches and has green eyes. That's a pretty good description of what the cat looks like.
Personality: Mischief, shy, light-hearted, untrustworthy, clever, strong. I'm pretty sure it would be awkward to see Berryspark using all those personalities.
Backstory: At the time, all clan blood that mixed would be killed on sight. A queen from FireClan gave birth to WaterClan kits, the leader of FireClan thinking they were his. Goosekit, Fallenkit, and Berrykit. Goosekit and his mother, Gingermoon, died from greencough, leaving his sister and him alone with the leader. Fallenkit changed, and Berrykit lightened up a little. As apprentice, Berrypaw was trained by his father, Blazestar. Unfortunately, Blazestar found out they were mixed, but couldn't kill them because he loved them. He told them to run, far away. Fallenpaw and Berrypaw ran until they found a forbidden Clan called LightClan. As Berryspark became leader, he could not take 'star' cause he never should of been born. That's a pretty good and descriptive description!
Mate: unknown. A leader without a mate, hmm....
Kits: unknown. If your a leader you need to take responsibility and not take care of kits so.
Mother: Gingermoon. Says that in description.
Father: unknown/Blazestar. Obviously Blazestar is his stepfather.
Siblings: Goosekit, Fallendove. I was wondering what his sister's warrior name was. Poor Goosekit....
Mentor: Blazestar. Yup.

That was pretty good. It was very descriptive and I love the affects you put on describing the OC. The rating is a pretty hard decision. I really can't decide. It was pretty amazing how he and Fallendove survived being half-Clan. My rating is...... 90%