I like the Turbo dressed as King Candy. That would be an interesting but sad thing too, if there were a scene of Turbo dressed as Candy, but only we the audience see him as him, everone else sees his disguise.
This right here is just weird, but you know what would be interesting. If Turbo had a son (somehow) named Rev who made his way into Sugar Rush and got a lot of crap for being Turbo's son, even though he's not his dad. Rev knows his dad was crazy, but he means know harm. Then he falls for Vanellope, because they both love racing. I know it sounds kinda cliche, but hear it is.