This is my character Pooka, and my first reference sheet ever.

Name: Pooka
Species: Puca of Irish folklore http://en.wikipedia.org/wiki/Pooka alternatively, a goat
Favorite color: yellow
Favorite things: Pears, mushrooms, colors, nature, pranks/scaring people, sweets

She is a shapeshifting creature, but rather than change species she generally alters aspects of her form to meet whatever needs she has at the time (see bottom right corner for examples.) She can not gain or lose matter, so her size generally stays the same and if she did something like make her arms longer she'd have remove length/size from something else to compensate. No matter what she transforms into she is always monochromatic with yellow eyes and teeth. Despite lacking much color she has a deep fondness for colorful things. Although she can change her form the pictured one is her normal appearance, she stands around 5'8. She has no breasts and an average/stocky build with a few touches of feminine figure especially evident in the hips, buttocks and thighs. Her arms are also very long with large 3 fingered hands.

Despite having wings she is flightless, rather she is able to manipulate the density (specifically weight) of her matter. So she is able to reduce this low enough that she becomes nearly weightless and floats a few inches above the ground, she is more often floating than standing. If she wants to move around quickly, she will jump forward with her strong legs with a reduced weight to launch herself fair distances through the air. Conversely she can also increase her weight, so theoretically she could jump up above something and then increase her weight to fall on it and cause damage to it. However she is not indestructible, and is actually fragile when falling so she has careful limits on the weight she takes on when coming down on something.

Personality-wise she is generally a benevolent, lighthearted trickster. She strives for balance and moderation in all things (yin yang — which her markings are influenced by) but struggles with duality, more often than not expressing two extremes equally rather than finding a happy medium. For as much as she is social and loving she can have moments of anti-social behavior etc. Keeping her various extremes in check is a private matter, and those she interacts with rarely see anything but the weird, unfiltered, silly and mysterious persona, and she's mostly harmless. Above all she has a very strict code of honesty, she is always true to her word and never lies. Though that isn't to say she wouldn't neglect to share something at first if it benefited a prank or two.