Can They Look Different To The Keeper Than The Conjurer?
The descriptions provided with a spirit come from the visual manifestation of the spirit during the conjuration process.
It is possible but unlikely that a spirit companion would appear differently to their Keeper than they originally did to the conjurer. When spirits initially manifest, they appear as they want to be seen by human Keepers. They remain in that form for the duration of their relationship with the Keeper. Occasionally there might be a slight variance in appearance from description. Not all entities are capable of being understood by the human mind when in their true form, which is why they choose more human-like or human-comprehendible forms.