Former Shortland Street star Shavaughn Ruakere is also in the show.
"I don't know if it's something I could see myself doing in a big production sense but it was definitely fun," Koopu said of the show.
"Tammy [Davis] kept changing up his lines all the time. It's pretty true to the name of the show - Only in Aotearoa - I think it's a lot of comedy that only New Zealanders will really get.
"While we shot the skit we were in hysterics pretty much every time we had to do it which was a bit of a problem for the production crew."
He told the Herald on Sunday although he enjoyed being on camera and joking around, he couldn't see himself pursuing serious acting roles, preferring reporting and commentating.
However, he stopped short of ruling put acting all together, saying if the right role came up he'd accept it and would definitely be part of Only in Aotearoa's third season if he was able to.
Co-star Tammy Davis said Koopu gave a good performance in the skit and had a "real natural charisma".
"I think he's got a lot to offer and he's only going to get better. He's taken his role as a commentator, as a TV personality, as a presenter, as an actor really seriously.
"I think we have to give him some kudos and some props and say 'hey man he's doing really well' because it is hard to break that mould - people see you a certain way."