He strode forward into the enclosure as he was announced to the waiting throng. He noticed a fair amount of booing emanating from the Hogwarts section, but couldn't bring himself to care much. When Bagman announced him as representing Hogwarts however, he did react. A quick volume enhancement charm (sonorous) to his throat and he was ready to rebut.
"Mister Bagman! I don't represent Hogwarts!"
The celebrity announcer was confused.
"But of course you do! You go here!"
"Be that as it may, I do not represent this school."
The crowd quieted, also confused.
Bagman asked. "Well, who do you represent then?"
Harry smiled. "Put me down for 'Unwilling Participant due to the interference of inbred Death Eaters and the assent of a corrupt and incompetent Ministry'."
Most of the crowd was a bit nonplussed, but Hermione gave a big grin at his cheek.
"Err, well, let's just shorten it to 'Unwilling Participant' then."
"Okay, for the sake of brevity, I accept."