So here's my personal 'sona, Ehna. I'm sure the design will be tweaked here and there, but this is basically it.

A few more details:

• The gem glows or darkens based on her current mood
• Uses clothing as an accessory, and will generally go mostly unclothed unless she knows it will upset someone around her. -- Examples: Shawls, hooded capes, bracers and 'leg warmers,' sari-like dresses, etc.

Likes:

• Collecting teas
• Wandering forests
• Finding mossy places to nestle into
• Sketching flora and fauna she observes around her
• Stalking watching people from afar.

Dislikes:

• Rude behavior
• Loud noises
• Gloomy days
• Large crowds