Sorry for the double post, but I found this bit of information interesting. Not sure if Rooster Teeth did it intentionally or not, but there's actually a really good reason for Tyrian's aura color to be purple. Look at this quote I saw on the Wikipedia page for shades of purple:
""Tyrian purple" is the contemporary English name of the color that in Latin is denominated "purpura". Other contemporary English names for purpura are "imperial purple" and "royal purple"."