If you're looking for anime similar to One Piece: Dream Soccer King!, you might like these titles. All recommendations are made by Anime-Planet users like you!
It's time for the Hidden Village's annual sports festival, and everyone is vying for the ultimate prize: a week off from participating in missions! Naruto and the gang are all in the running, but Naruto has a small problem: he has to go - BAD! Unfortunately for his bowels, finding a free toilet is an impossible task; and whether it's trying to sneak into the ladies' room or creating clones to take over for him in the games (who, unfortunately, are also experiencing a fecal crisis), nothing Naruto does gets him closer to his goal. He must compete in the games and keep himself from having an accident - can Naruto succeed?
If you liked the sports-centric Dream soccer king, then you may also enjoy the equally pointless and sports oriented Konoha Sports Festival. Neither are to be taken seriously, and are just a bit of fun, so if you liked this, then try the other.