One Piece, Magi: Sinbad no Bouken (TV) Recommendations
1.both are shounen, adventure, action, fantasy and comedy series.
2. both happen in an imaginary alternate universe.
3. both animes start with a journey.
4. luffy want to be the king of pirates, sindbad want to become the king of the country he want to make. nonetheless both want to be kings.
5. both protagonist gather friends/nakamas during their journeys.
6. in both the main character and his friend travel over the seas and visit many places.
overall i think the adventure lovers will love both.
Both MC(Luffy and Sinbad) wants to be King. They both have extraordinary power and with their crew they visit different country.
If you liked the part of one piece where Luffy gathers his crew, then you might like this prequel of Magi.
*IDK IF YOU CONSIDER THIS A SPOILER*
It is where Sinbad gathers his crew that will one day help him build a country, and where he becomes possibly the strongest character in the series
(MAGI IS MY FAVORITE ANIME SO IM BIASED AND SINBAD IS MY FAVORITE CHARACTER IN MAGI AND IN ANY ANIME)
Although I recommend watching season 1 and 2 Magi first so that you will understand what is happening.
it has a similar premise of travelling through new islands and great characters. this probably tells you nothing but trust me its a fantastic anime