Super Mario Maker's release is right around the corner, but I was thinking of some ideas for some Enemy DLC, like Banzai Bill for instance. True to it's first appearance they don't start out fired from a bill blaster, but like nearly every other object they can be placed in one. Like the Clown Car in Super Mario World, Banzai's sprite is reduced in size, however feeding it a Super Mushroom will make it it's, "normal" Size. Shaking it will turn it into a red Mario-seeking Banzai Bill, while giving it wings will make it bob up and down, similar to their look alike counterparts, the Killer Bullets from Megaman, give wings to Mario seeking ones, and they'll move faster so watch out!
Super Mario Maker (c) Nintendo
Megaman (c) Capcom