His persistence may come from heading a team of economists at Nomura Securities, a major Japanese brokerage famous for its cut-throat culture, where contemporaries say his quiet, restrained character earned the respect of peers.
Before joining the BOJ, he was a frequent expert commentator on economics for television current affairs shows.
Back to rate policy
When Kiuchi joined the BOJ in 2012, he was considered a reflationist who could instill a dose of boldness in a board seen by many analysts as too as timid in addressing persistent deflation and a strong yen.
But when Kuroda arrived and led a radical policy makeover eight months later, Kiuchi found himself in the camp of the conservatives suspicious that money-printing alone can shift consumer expectations of falling prices that entrench deflation.
Unlike others on the board, Kiuchi refused to change tack and continued to warn of the risks of QQE. He feels that, while QQE was effective in shocking people awake from stagnation, it is ill-suited to respond to blips in economic and price growth.
That is why the BOJ should taper asset purchases soon and revert to a policy targeting interest rates, he argues.
As the April 4 anniversary of the introduction of QQE approaches, Kiuchi faces his own time of reckoning.
He remains mum on what he will do with his proposal to review the program in two years. Kuroda is unlikely to swallow his call for ditching the timeframe, and the board is too fragmented to rally under Kiuchi in revolt against the governor.
Still, outliers have traditionally served a key role on the BOJ board and Kiuchi may be no exception.
Nobuyuki Nakahara proposed adopting quantitative easing and an inflation target in 1999, when these concepts were barely known in Japan. Years later, the BOJ adopted both ideas.
It is uncertain whether Kiuchi's proposals will see the light of day, but his presence will help the BOJ face up to the tough realities of QQE, analysts say.
Kiuchi continues to do just that.
"One big accomplishment of QQE was that it made the public understand the limits and flaws of monetary policy," he told a recent news conference.