Snow on tar - White/silver mane and tail on a black body
+1| [Color ref] pretty clear cut.
Shoulder the scars - "Helovian Scarring: Right shoulder had massive scar when the skin was cut away from the muscle; inflicted by Illynx."
+1| [History ref] that is a pretty specific clue, however I think it's further justified by the sheer amount of battles she's been in and the scars she's taken from them. A bit on the fence with this, but I think it makes sense.
Maleficent, mongrel, macabre - Personality is described as Evil and causes frequent injury with her magic ("Her presence rots the flesh of mammals and birds") thus macabre. Her companion's name is Mongrel.
+1| [Personality ref] again really straightforward, particularly the macabre part.
+1| [Companion ref] mongrel definitely gave it away for me for the companion, and also suits her theme as well.
4/3 necessary to pass
Overall great stealth. You had a lot of very basic clues, but I think they all were very good at being direct and easily understood, and all together helping direct towards a specific character.
Helovia Hard Mode