Zawabashi would be a great name for that shadow gorilla pet. Other more funny kinda names would be: Zimba, Matsuoo, Lugnut, Optimus Primal, Bones, Knuckles, Kong.
Deputy Owner of Fate Decided.
Harambe, but with a shadow or darkness twist... Har... Harebony?... Shadambe... Harambow... wait, isn't that a gummy bear? This is hard. I'm gonna look up words that go with shadow.
Obscurambe, or Adumbre from the word Adumbration and Harambe... I just really need to see this Gorilla named something relating to Harambe.
Harumbra sounds pretty sick, so that's my vote. (Harambe-Umbra)