What should be Zaiaku's Sage Mode Animal?

Gorilla i think :3 XD

Gorrilla has been done. Maybe Rhino?

rhino would fit Zaiaku's physique...here are some fitting proposals:

-Boar
-Bear
-Crocodile/alligator
-wilderbeast
-Panther/Jaguar (black in this case)
-Panda xD (sure it's also a bear, but funnier)

Does..it really matter if a certain animal is taken for Sage Mode? The Anime/Manga has shown there can multiple Sages of the same animal (Jiraiya, Naruto, and Minato having Toad Sage Mode, for example).

it doesnt matter, there can be numerous of each XD

When did Minato have Toad Sage Mode?

Its said on the Wikia Minato was a User of Sage Mode (pictures in Manga to prove it), and, judging by appearance, was Toads.