Who do I think I am? Good question, really, and I'll answer like this: I've seen too much to be Robin, but I'm still too optimistic to be Batman. I'm Nightwing. 

My name's Nightwing! I may not be the gent you were expecting, but let me assure you... like him, I'm the stuff of nightmares. So don't get stupid! If you play it cool, you may walk away from here with all your teeth. 

I can't replace you, Bruce... but I'd be lying if I said it's not going to be wild standing in for you.