I mentioned in my Sombra head-canon how Sombra Fragment manifests himself either as a voice or as a vision in reflected surfaces, and only Sombra Prime can see/hear him. Well, that not enterily true, because there was a short period of time when somepony else also could also see him. A little filly.
 
Her name was Noche, she was the daughter of Sombra Prime and Radiant Hope, who for some reason could see (but not hear) him, much to Sombra Fragment’s suprise. The reason may be because she technically part umbrum. Because of his eyes, all the armor and shadows Noche didn’t realize that the strange pony look a lot like her father.
 
This only lasted a few years and seemingly she grew out of it. Sombra Prime and Hope only found out about it after.
 

 
Btw, this is connected to a drawing I posted long time ago. It can be found hI mentioned in my Sombra head-canon how Sombra Fragment manifests himself either as a voice or as a vision in reflected surfaces, and only Sombra Prime can see/hear him. Well, that not enterily true, because there was a short period of time when somepony else also could also see him. A little filly.
 
Her name was Noche, she was the daughter of Sombra Prime and Radiant Hope, who for some reason could see (but not hear) him, much to Sombra Fragment’s suprise. The reason may be because she technically part umbrum. Because of his eyes, all the armor and shadows Noche didn’t realize that the strange pony look a lot like her father.
 
This only lasted a few years and seemingly she grew out of it. Sombra Prime and Hope only found out about it after.
 

 
Btw, this is connected to a drawing I posted long time ago. It can be found here