Hear is a picture of Sin and Zero. Zero you should all know: [link]
But let me tell you a little more about my OC Sin. You probably know allot from my other pictures of her in the past. She is really a Slime, but with most Slimes that age she can change their shape as well as their form. She is is over 5,000 years old, but for a Slime that's not all that strange. Slimes are much more different than humans.
The out-fit she has on now is just her Witch hat and some matching cloths, She changes her cloths all the time, but they always have some purple in it. She also always has on that necklace, it shows her devotion to Aurorin the Moon god. While is is in the Humans world she makes an attempt to fit it so she can better learn about them.
She has studied in all schools of magic and has earned the title Grand Mage. She fallow the teachings of Aurorin giving her Priestess Magic, and a since of loyalty to help others. She can be a bit of a show off at times, and doesn't really understand the human world witch can really get her into trouble. She also really good at getting out of any trouble she happens to get into. She is friendly and curious about humans, she seems naive about allot of things, but don't underestimate her.
Oh and about her tail... well she just likes a furry tail, that's it.