Despite that he made the school's top teams and was selected to represent Wellington in the Under-16 team at the New Zealand Youth Futsal Championships in 2017.
"He was just this nice kid," Keat said. "For this to happen is a real shock."
The 19-year-old was reported missing on Tuesday.
He was last seen walking out of the admissions area of the Gisborne Rhythm and Vines festival site at 2am on Tuesday.
Search and Rescue volunteers found his body in the Ormond area of Gisborne yesterday.
Online tributes described Wong as a "dynamo both on the futsal court and football field" and a "mad skilful player ... and just a really nice kid, wouldn't hurt anyone".
Another person said he was a "very talented player and a lovely well-mannered boy".
Police said there was nothing suspicious about his death, which had been referred to a coroner.