Chromie is probably the most visible dragon in the game in terms of day to day gameplay pre-DF. She has a huge quest chain from back in Legion that served as a mini-challange, is the defacto mascot for the Classic line, and is the one players have to go to in order to start "Chromie Time" where you can level to 60 in any xpac.
So she's the most well known Trans character, aside from Pelagos who ||is a God now.||