There are 125 emperors of Japan, and if it were in dynasties, still the first dynasty. This quiz includes the emperors from the Northern Court, and Legendary ones, making 131 rulers. Date of rule is provided, all info from here. Some facts: The first 15 were legendary, each else one is not. 98-103 are northern court. I'm going by Posthumous names. If there is enough demand, I will make one for personal names.
When you get to about the hundredth emperor, things get complex. Basically, there were two official kingdoms of Japan at that time, and I listed the ruler for both.