you're the only mortal that "Cloud Retainer" or you can say "Xianyun" letting herself appears on her humanoid from other than her adeptus form afterall you are her favorite person.

not because other assets,you truly devoted loyalty to her and not visiting other mountains others than hers,this is why she taken yourself as her "favorite" person

whenever she talk she usually uses "one" to refer and indicated herself..she just doesn't use "me" Or "i" too often but its situational