Why doesn't Chochem volunteer to be Santa Claus, besides the fact that otherwise there would be no movie? He's already a wise immortal being, possibly with supernatural abilities, who cares about the well-being of Martian children. In any case, he probably would do a million times better job being in charge of delivering presents to every child on the planet than the "laziest man on Mars."
He didn't strike me as particularly jolly. A Santa like that would probably make the martian kids even more depressed.
He also seems like he can barely get through a conversation without keeling over. I can't see him shimmying through vents, or building toys even if the production is automated.
Why the hell does Dropo live with Kimar? Or if he doesn't, he's certainly around his house all the time. Is he Kimar's manservant? Shouldn't the (apparent) ruler of Mars have a better manservant if that's the case?