Shade's attire, heals and choice of light as main weapon is shared with Kidman as well as it only appeared inside STEM when Kidman did, however whenever it devours a victim it says 'your body' which could represent Ruvik's desire to have a physical body. It is implied to be the merge of two personalities within STEM: Kidman and Ruvik.
Shade is depicted as a harsh and relentless pursuer against the main protagonist, Juli Kidman.