Early in EW's service once players finally got to experience RPR for themselves and inevitably went through EW's story past... that scene in Garlemald, there was a fair bit of speculation after seeing Zenos's unique avatar design that SE did have that as a plan, that the avatar would eventually change appearence as you got 'stronger' in the art.
Alas, as we found out in 6.2's main scenario Zenos's avatar really was unique and is her own person (in more ways than one), so it's highly likely that will not be the case now, other than maybe some way of reverting the avatar back to their 'mortal' form like what the WoL did to Zero.
Bare in mind I don't play RPR though so that was just idle musings from me.