Who are Rogue and Sting and when were they first revealed?
Rogue and Sting are members of the Sabertooth guild. They make their debut at the start of the Grand Magic Games arc, in anime episode 151 (Title: Sabertooth) and manga chapter 258 (Title: Sabertooth). Rogue is a Shadow Dragon Slayer, while Sting is a Light Dragon Slayer.