TOKYO—An official responsible for the assets of Mt. Gox told creditors he would consider returning the bitcoin that remains with the defunct exchange without converting it into regular currencies, people who attended a closed meeting with creditors said.

Some of those who had deposits with what was once the world's largest bitcoin exchange welcomed the possibility of keeping the virtual currency unconverted, avoiding a potential drop in its value. But they also expressed their frustration with a bankruptcy process they say...