The green Donkey Kong represents Blanka, a large, green, muscular fighter with a beastly nature.
The stage and music track represent the Amazon River Basin, a jungle river stage in Brazil which serves as Blanka's stage in Street Fighter II.
Donkey Kong starting off with a Screw Attack references Blanka's feral and electrical fighting style, where he uses rolling attacks and electric-based attacks in his moveset.
Other trivia:
This spirit's Electric Attack ↑ ability further references Blanka's electric-based attacks in his moveset.
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Don’t scream, that’s no beast! Meet Jimmy, better known as Blanka. Being stranded in the Amazon as a young boy, Blanka was forced to adapt to the wilderness, developing green skin and the ability to discharge electricity. Since returning to civilization, Blanka has reunited with his mother and has even started up a business! Speaking of, do you want to buy a Blanka-chan doll?