Will Neil Patrick Harris Be on ‘How I Met Your Father’? — Details on Cameo

But Neil Patrick Harris himself addressed the possibility of an appearance in his newsletter, Wondercade, where he interviews HIMYF star Hilary Duff (per TV Line). “As for coming on your show (insert joke here), I worry,” he told the former Disney Channel star. “Barney’s antics, his overt delusions of grandeur, would likely get everyone in trouble. So, unless he’s changed his ways or joined a nunnery (insert and insert joke here), not sure if it’s in anyone’s best interest.”