These are from left to right: Doug, Miyumi, Maribelle and Hakata from Astronaut Elementary
It's not my best, and I almost didn't make it after seeing the work of a professional pixel artist, but hey, I'm still learning and hopefully improving!
Doug looks like Bomberman though.... :(
ZIPPY DEE DOO! It's Brisco from Robotz of the Company !
Or at least, how I imagine him, because Robotz of the company is audio theater...
Brisco is a cleaner robot who is always happy and cleaning the grimiest gunk makes him the happiest robot in the world!