6. Ojarumaru (Prince Mackaroo) with 1550+ Episodes
This comedy series is extremely famous throughout Europe and Asia, though it has not been released in America yet. Featuring an absolutely adorable protagonist, it is a must-watch for kids (and adults) of all ages, making it one of the longest running anime in the world as well as one of the most beloved.More On Top 15 Longest Running Anime Next
