Maybe not the most convincing collection of clues, but I still definitely see Romani, even with my interpretation of it.
Pass
A dove, though not in flight
[Appearance ref] Dove is the origin of the word for "palomino", her coloring. http://dictionary.reference.com/browse/palomino?s=t ; [Species ref] Not in flight - she's not a pegasus
I think this clue is a stretch because you would have to find this page. However, dove implies female, and to me, that still points to Romani.
Only the sea as an embellishment
[Appearance Ref] Normal coloration, but she has blue eyes. [Species Ref] She has no horn or wings for an embellishment. Blue eyes are her only defining fantasy feature
I felt like this was your most solid clue. When I read it, I had no doubt you were talking about blue eyes. That narrows down a lot of characters.
With a monochromatic wake
[Possession Ref] White (monochromatic) tiger companion that follows her around (thus her "wake")
I read this.... pretty much as a color reference. So I thought maybe white. But Romani's coat is also monochromatic, so it still applies.
Horizon to horizon, sailing upon the intrepid waves
[History Ref] Left her home to come to Helovia (horizon to horizon), and she [Personality Ref] sails upon her spirit of adventure and exploration (intrepid)
Great clues about personality and history.