I didn't design these. I just made EACH of them background images transparent and convert the .BMP into .GIF image. These images were ripped from the MegaMari game. I used Irfanview to do transparency.
Anyway you can use them whatever you want as long ou don't Credit me.

Suika Ibuki
I'm soooo drunk.

Cirno
I can make summer into Winter.

Yukari
My Parasol can fly anywhere

Remelia
I can never die from earth.

Aya
I was able to see/hear things from great distance, manipulation of wind

Lunasa
I'm the oldest of the Prismriver sisters. I can play a violin without physical contact

Sakura
I can change time and master knives.

Reimu
I trained to be the greatest master.

Patchouli
My elemental magic is stronger than all of you girls.

Alice Margatroid
I master all kinds of dolls.

Marisa Kirisame
I am a Magician, Kirisame Magic Shop owner, Burglar, Part-time Youkai hunter.

Chen
Black magical arts

Eirin
I can create all types of medicine, genius-level intelligence.

Hong Merin
I can control of "Chi", martial arts

Lyrica Prismriver
I'm the youngest of the Prismriver sisters. I can play a keyboard without physical contact.
Medicine Melancholy
Attack me and I will Poison your entire body.
Merlin Prismriver
I'm the second daughter of the Prismriver Sisters. I Can play a trumpet without physical contact

Mystia Lorelei?!?
I'm not sure about this one, but her image is hard to find >_<

Ran Yukumo
I use Black magic and shikigami rituals.

Reisen Udongein Inaba
My powers are telepathy with other moon rabbits

Rumia
I can manipulate the darkness

Youmu
Feel the power of my Katana. It hurts like hell once I slice you.

Yuyuko
I can invoke death in mortals
Enjoy
CRAP, wrong forum. Can you guys move it to Pixel Art. Thanks.