The green Snake represents Snake Man, a green Robot Master who shares the same snake-themed name.
The stage's trees and music track represents the Snake Man Stage, a scaled stage which features Snake Man as a boss in Mega Man 3.
The Bombchu item references Snake Man's weapon, Search Snake, which allows him to generate robotic snakes that can crawl across solid surfaces.
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Quick and lightweight, Snake Man was built to explore topography on planets flagged for human development, his reptilian body able to explore tight spaces and various terrains. His reconnaissance-based Search Snakes, able to crawl along any surface, were reprogrammed alongside the Robot Master himself into seeking missiles. His weakness is the Needle Cannon.
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