Last year my friend and I cosplayed characters from Nabari no ou and no one recognized us besides one other person cosplaying from it...but I wouldn't say they are obscure.
This year my roommate is dressing as one of the zombies from Plants vs Zombies, road cone and all.
yea the manga is awful. I was hoping that the manga would go into more detail about the characters and the plot instead of being EXACTLY like the game. plus it was very rated G.