How about a subject? as in most riddles have a subject could you put one up for the riddle?
As I said, I have no idea what you would actually classify the subject as (hence why I listed subjects that is definitely wasn't) because if I did create a subject name it would end up waaay to specific :c If you really want though, I guess they're not technically an object, but not technically a character either. The things in the riddle do have dialogue boxes though, and as I said show up in at least 3 or so games.
EDIT: Wow, wow, wow hang on. Lol, you all just ninja'd me to my own riddle there XD
And nope, neither are right, but peahats you're in the right game there (one of them), and the right kind of area. But I was thinking more like having personalitly traits in common :3