Mr. Shine and Mr. Bright are a duo boss from the Kirby series. And personally my favorites to be honest.
I guess I was really impressed by their tag-team fight in Kirby's Adventure on NES. I would always refer to them as the sun and the moon. I liked how the light changed if they sun dropped in the back so the moon could fight.
Their other main appearance was in Kirby's Dreamland 2 on Gameboy. They fight about the same, but I also remember a move that used both characters that was something to avoid.
I also enjoyed seeing them comeback in Kirby's Adventure's remake Kirby: Nightmare in Dreamland on GBA. They're much bigger that time around though.