Alright, I'll be doing Lionmask!

Name: Lionmask
Okay, I like Lion and mask together! That's cool and unique!

Age: 49 moons ( at death )
That's so sad, she died so young! ;-;

Gender: Female
Okay. But in Warriors, she would be a she-cat ;)

Rank: Warrior / Queen
Okay, I like that! Warrior is cool. And she was a queen, which is cute.

Clan: ShadowClan
You get points for that! ShadowClan is really underrated, so it's awesome that ShadowClan is where she lives!

Personality: Lionmask has always been a grumpy cat with a tendency to be aggressive. She is cold towards cats she has just met and often snaps at elders, but is always gentle around kits. She is extremely loyal to her Clan and always puts her loyalty first.
Ehhhh....I don't feel like this balances out too well. She's grumpy and aggressive, yet she's gentle around kits. Maybe change that up, but if you don't want to, that's fine. Another thing I would do is add a few more good attributes, seeing as she doesn't have many. It's good that you have plenty of flaws, but not enough good characteristics to balance it out.

Looks: Lionmask is a broad-shouldered golden she-cat with long fur. She has faint tabby stripes and a dark mask and tail. Her green eyes have darker flecks ringing the edge of the iris.
She makes me think of Lionheart. I like her appearance, but I can't picture the 'dark mask and tail'. What colour exactly is 'dark'?

Family: Mother - Poppytail ( small golden she-cat with darker mask and tail, amber eyes )

Father - Aspenarch ( large brown tom with darker stripe and green eyes )

Sister: Sungleam ( golden she-cat with tabby markings and amber eyes.  )

Mate: Gorsebreeze ( brown tabby tom with a white muzzle and green eyes. )

Kits: Dawnkit ( golden tom with green eyes ) and Molekit ( brown and gold tom with green eyes )
I love the creative names such as Apsenarch. Sounds very cool.

Background:
As kits, Lionkit and Sunkit were close. But their friendship thinned when they became apprentices and both of them grew attracted to Patchpaw. In the end, Sungleam won his heart and Lionmask grew bitter towards her.

Lionmask was close to Gorsebreeze, as they had grown up together. It never occurred to either of them that their friendship might turn into something else until they were in a battle and Gorsebreeze was injured badly. Luckily, he survived and they became mates.

Lionmask moved to the nursery and birthed Dawnkit and Molekit, happily nursing them to apprenticeship. She lived to see them get their warrior names, Dawnheart and Molestep, before she passed away from Greencough beside her mate.

Aww..what a cute story. I love the fact that Lionmask found another mate instead of Patchpaw. That's awesome.

Anyways, I give her a 7/10

She has an okay personality, but I would change it up a bit. I love her story, and she dies at such a young age.. ;-;