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Harry will have competition as the House cynic of his year, in the person of Zacharias Smith. From the Lexicon:

"A real winner of a guy who seems to offend people every time he speaks. Zacharias joined Dumbledore's Army after overhearing Ernie and Hannah talking about it, and was immediately a constant skeptic, not shutting up until Fred and George threaten him with a “long and lethal-looking metal instrument” and Harry pointed out that Expelliarmus, a spell Zacharias scoffed at, had saved his life while dueling with Voldemort.

"A year later, he was hardly a year wiser, pestering Ginny for details about the Department of Mysteries until she got fed up and nailed him with a Bat-Bogey Hex. Zacharias also commentated for a Quidditch match that year, making the Gryffindors so mad that the moment the match ended, Ginny barreled straight into him on her broom. Finally, Zacharias ended his illustrious Hogwarts career in style by not only being the only D.A. member not to fight in the Battle of Hogwarts, but by beating down first years to be the first one out when the school was evacuated."

We know that he is in Harry's year, since his name appears on the list of students in his year, visible in the old "Harry and Me" TV interview.