The design of Lanka seems to resemble Asgard from the movie Thor in a dark version.
The scene from the movie Thor seems like a more shinier and gold-laden version of Asgard.
The VFX team was not able to give Sugreev a unique look either.
The look of Sugreev closely resembled Caesar from Plant Of The Apes.
Ravan's Pushpak Viman seems to be connected with the Game of Thrones in terms of looks.
The Pushpak Viman bears a close resemblance to dragons from Game Of Thrones.
The characters in the opening scene seems resemble death eater from Harry Potter.
Here's a reference from Harry Potter.
As per social media, the character from Adipurush looks vert much like Grim Reaper from Harry Potter.
Representation of the Grim Reaper from Harry Potter.