That Jumanji character looks the way he does because they’re mirroring the classic big game hunter from over a century of British colonialism in Africa and India. I mean that was an iconic figure in real life and fiction since 1858, it’s not something people saw for the first time in Jumanji.
The Jumanji dude is the civilian version of these guys. https://www.youtube.com/watch?v=1csr0dxalpI
Note the pith helmets and Color Sergeant Bourne’s muttonchops.
Griffin just has the muttonchops. No pith helmet, no khaki outfit. He’s otherwise the classic, iconic Australian bushman. The stereotype Crocodile Dundee was making fun of. I mean we here in America saw Crocodile Dundee and saw something original, but in Australia that character is making fun of a real cultural tradition.
Griffin is a mashup of that colonial British hunter, the White Hunter, and the Australian bushman.