Hello, This sounds like a really fun retro project. I would be interested in helping with the two NES-style character sprite sheets, especially the mech/robot design and the climbing, falling, walking, punching, and death animations.
I would love to hear more about the gameplay and the visual direction you want for the characters. Feel free to message me with the reference image and any specific requirements, and we can discuss the scope and a fair price from there. have add you up on discord and here is my discord name; Kenith0886