Beyond that, a number of fan-favorite anime trios have since been split up and are worth looking back at. Some of the anime already listed here have new seasons coming out in the near future, notably Attack on Titan and My Hero Academia. Updated by Theo Kogod on October 23rd, 2020: The trope of three friends teaming up to go on an adventure is as old as time and it has become a classic staple of anime. All these trios have one thing in common though: they made the story unique and became truly memorable. Some are strong and determined main characters, others feature shy and quiet protagonists. There are many iconic trios in the anime world, some composed entirely of villains, others of heroes, or a mix of the two. In a trio, however, there are ongoing tensions, a strong sense of competition, and rivalry that can also become jealousy which makes the whole group that much more interesting. RELATED: 10 Best Anime Duos Of All Time, Ranked

There is always a sense of co-dependency, a need for the two characters to continue on together and it makes their relationship stronger.

In a duo, characters either complete one another or challenge each other. The relationship dynamics in a trio are more complex and delicate than in a duo which makes them, according to the 'Rule of Three', more humorous and effective.