This is a riddle without a twist. A straight forward one. Not almost, but all the lines will point you in the right direction. The puzzle is really really easy. I am sure someone is going to post the answer within minutes. Good luck!
My younger brother is Mr. Wayne,
And the beginning of all his painI will tease your eyes with nails
But, I won't let you close your eyesTo make it simple, cut my tail
With my new tail, you won't failNow take some of my exact middle
That will help you solve this riddle
Then cut its end, the beginning of the end
It's a wordplay, that's a hintMy New head and tail are almost the same
If you place a mirror in betweenMy lost tail is definitely not for doctors
Tell me who I am, that's what matters