Mine seems to have disappeared.
Do you have the spolight widget still installed ?Or did you disabled the widget?
For me when Spolight widget was installed the MX Avatar wasnt.But the originsl avatar was still there .When I cleaned cache clean data of the spotlight widget and then deleted it the MX avatar returned.So I then had 2 avatar again.The original Avatar and the MX avatar.
I didnt disable those since the have I cleaned out data and cache on those.Just preference on that without disabling Spotlight Widget will still show in playstore with disabling it wont.
If you had already disabled the actual avatars they will be way down near bottom of : Settings>apps>all .All disable stuff gets moved down there.
sent from Moto X