From her Paragon bio:
Uma was a normal girl, human, until she saw her first unicorn. At first she wasn't positive that it had happened, such a fleeting glimpse of it. But when she followed after it, she learned it was true: there really were unicorns in the world. This one however had plans for her. It played a game of hide and seek, allowing Uma to see him now and again, drawing her farther and farther away from her home, deeper into the fey lands where he ruled.
When the day came that she realized she was not even human, she was now a wandering half-fey creature, she sought out those who had also seen this creature. On finally locating him while asleep, Uma touched him and begged him to return her to her own world. He did. But at a price. She roams as a unicorn in his world, by his side when he demands it.
When she is in her human guise she still bears odd markings from the other world. But she is more comfortable now walking with hooves, using her magical powers, to defeat evils in this world.
From her Domina page:
Uma Khayali, Care of Magical Creatures and occasional Taxidermy instructor
Female, age 35
Hair - blond; Eyes - green; Skin Tone - white with fur
Preferred Clothing - usually she wears the skin of an animal (unicorn) to adopt its powers. When she's feeling human, expect her to be in normal everyday t-shirts and jeans. Don't expect that often, she loves that feeling of fur.
Specialties - Uma is an animist, not just an animal-shaper, but she is able to acquire the appearance and abilities of an animal (usually magical) by wearing its skin. Yes, that means she has to kill and skin it. That's part of the ritual, believe it or not. She does however care quite a bit for animals, both magical and mundane, so it often creeps people out that she loves them to death like that.
Weaknesses - She is the chosen concubine of a wild spirit that inhabits the northern forests, and at his whim she will return to his side. He does occasionally show up in human or elk form at House Domina
Wand - Uma doesn't need a wand, she has a horn. The horn is from the unicorn that she killed first, it actually is a solid emerald growth (like the hooves of this animal) and casts an eerie, greenish light at all times. It's almost 30 inches long, one doesn't want to mess with this wand. Ever...
Familiar - does her mate count?
Unusual Studies - she'll pick apart her food, as well as any nearby roadkill. She's like that. But she also has the ability to cure ailments from the common cold to cancer, poisons retreat from her touch, and when she's in full unicorn shape she is downright terrifying.