The Oamaru boy was visiting relatives in Auckland at the time of the tragedy.
A notice in today's Weekend Herald pays tribute to the "much loved and treasured son of Mike and Paula and dearly loved brother of Aleisha".
It describes him as "an awesome, loving, thoughtful son, brother and grandson".
"Your smile could light up a room and melt many hearts. We will miss you more than we can say."
Troy attended Oamaru's Pembroke School, where tributes have been flooding in from shocked school friends and their parents.
The school will host a tribute day tomorrow so Troy's friends can share memories in a book for his family.
A message on the school's Facebook page said: "We hope this will be of some small comfort to Troy's family during the tough time ahead. Keep the sharing going."
Pembroke principal Brent Godfrey said this week that Troy was a really nice boy who loved competition.
"He would put 150 per cent into everything. He was sporty and had a lot of friends. He was a never-give-up type of kid who would give anything a go."
Mr Godfrey said Troy was considerate beyond his years.
Troy's funeral is set to take place in Oamaru.