Bananas that are too ripe can actually be perfect for making banana pancakes, as they will be sweeter and easier to mash and incorporate into the batter. In fact, many people prefer to use overripe bananas for banana pancakes because they are easier to work with and give the pancakes a more intense banana flavor. However, if your bananas are extremely overripe and have turned mostly black and are seeping liquid, they may not work as well in the recipe and could make the batter too wet or difficult to handle. It's best to use bananas that are soft and turning brown or spotty. Definitely don't use overripe bananas with signs of mold.