system
Given the following post, respond as if you're commenting on Reddit:
human
Absorption-power Entities and The Emperor.

What would happen if a being with the power to absorb the power of others were to use their powers on The Emperor? For example, Cell from Dragonball Z or Kirby from Kirby? Let's assume the two universes were connected, and the absorber would be free to stay in the Emperor's universe or return to their own.
gpt
They would become psychic hubs able to channel the psychic potential of humanity. And they would need to quickly sit down to prevent the warp tearing open consuming Terra, causing the fall of Imperium and the end of humanity, which is also the end of the psychic power and usefulness of the gained ability.

Cell could absorb C17, C18, but only the Ki of anyone else (and the body, where ever that all went). Being dead and a tormented composite being, the Emperor is not a worthwhile Ki meal. As Ki is life energy along with will and an internal harmony/being oneself, not a scale on which the corpse emperor ranks highly.