Orange Glow Sunlight 2.3s 25ft Healing Heal one party member.
Shade Comet Shadows 2.4+s Infinite 1 Hit Inflict damage on the target and nearby enemies.
Nether Wave Shadows 2.8s Melee (+ 30ft) 6 Hits Close combat attack with the final attack reaching enemies in the back.
Earth Heal Sunlight 2.3s 25ft Healing Heal party members in the vicinity other than yourself.
Shooting Star Sunlight 2.4+s Infinite 1 Hit, medium knockdown Inflict damage on the target and nearby enemies.
Roundel Sunlight2.4s 15ft Radius Attacks all enemies in range.
Pure Geyser Sunlight2.8s Infinite Attacks all enemies with the power of water.
Disruption Wave Sunlight2.8s Melee (+ 30ft) 6 Hits Last hit inflicts forward splash damage.
Zodiac Shadows2.4s 15ft Radius Attacks all enemies in range.
Blossom Shower Sunlight4.2s Infinite Healing Heals all allies.
Terra Externa Shadows2.8s Infinite Attacks all enemies with the power of the earth.
In her canon, Astra is basically - as I understand it, the light or purity in a person's heart. Everyone in canon has it, but the astra shines to varying degrees. Normal people, it just a regular light, but in Polka, it shines the brightest. Because there's so much of it and it shines so brightly, it pretty much is killing her. The astra is a source of her magic, and everyone who has magic in her canon is dying of an illness.
Second point: Polka is meant to be a sacrifice to 'calm' her world down whenever it starts to get unbalanced with the threat of war and such. She's made the same journey for hundreds of years, and each time her journey ended with her throwing herself into the sea (what she calls becoming a Heavens Mirror), the world 'resets'. Any destruction or desolation the land takes is reborn, Polka is reborn and the cycle starts again.
Third and Last point: Seeing as her astra is what is killing her, making her ill and the like, there's really only one way of extending her life - by using the astra up. There were spirits of the forest called agogos in her world, and the Mother Agogo could absorb her astra when it got to be too much for her and she collapsed. Similar case here - when the astra gets to be too much for her, Polka's going to be able to use her astra to restore the land around here for a small area.
So to Sum up
She has a fairly strong healing ability.
Despite her frail constitution she has spells that allow her to attack which are fairly strong.
She can only cast attack spells if she's standing in sunlight or shadow. Her spells are not holy/dark element, most of them are water/earth element.
After using her magic, she often gets coughs or sneezes. This is because...
She has a terminal illness. That's right, she's dying peoples, as a direct result of her astra building up and poisoning her. However, she won't die hopefully because..
She now has the ability (mod-approved) to use her astra to restore a small area of land around her if it's damaged.
Permissions for my character:
... Hug Polka? Polka is a fairly respectable and formal little girl, so she won't hug you unless she knows you well and you really need a hug. She won't refuse hugs though.
... Kiss Polka? O-oh my. Erm She's not looking for a relationship or anyone so if this happens it'll probably be awkward and she'll be flustered - but ..
... Kill/Maim/Hurt Polka? No killing, but why would you want to hurt the cute little fluff?
... Kidnap/Torture Polka? Um - discuss it with me first, but odds are I'm okay with it n.n
... Backtag with Polka? Yes
... Threadjump with Polka?Within reason? Yeah, absolutely.