Tha'p
Elder Spirit concerned with rational thought
The physical appearance of an Elder Spirit is a subjective matter: usually, they appear to be the same race as the viewer. In many recorded instances, two or more viewers of different races have seen the same Elder Spirit appear as two or more races at the same time. Physical recordings of Elder Spirits generally retain this same property, otherwise they show only fuzzy, indistinct images.
In gendered races, Tha'p most often manifests as female-equivalent.