The main characters apart from Sinbad include his crewmates. These are the people who sail with him and share in his adventures. They might have different personalities and skills that contribute to the story. Also, there could be some magical beings like genies or sea nymphs that he meets during his travels. They often have powers that either assist or oppose Sinbad.
Yes, Sinbad was a real sailor. The Sinbad real story is about his amazing adventures at sea. He sailed to many far - away places, facing numerous challenges like storms, sea monsters and pirates. His tales were full of excitement and danger.
The Old Man of the Sea is an important character. He attaches himself to Sinbad's back and won't let go, causing Sinbad a great deal of trouble. There are also the captains of the ships Sinbad sails on. They play important roles in the voyages and some of the decisions made during the adventures.
There probably is. Fanfiction often brings together unexpected characters from various works. Since both Naruto and Sinbad are popular characters in their respective series, it's not surprising that someone would create a fanfiction where Naruto is Sinbad. It could be a really interesting read, with new storylines and character developments based on this unique concept.