These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Designated Hero: Sinbad during most of the movie. He starts it off trying to rob a ship, decides to leave his friend to die (albeit under the belief that said friend's father wouldn't let them carry out the sentence), and has to be talked into taking any responsibility - and then he goes after his best friend's fiancée. Eventually he grows into the role of hero in the latter half of the movie, up to and including going back to face his own execution without any expectation of a reprieve, so it may be more of a case of Character Development at work.
Ensemble Darkhorse: Eris who, despite being the villain, has very little screen time. Through Evil Is Sexy and her gorgeous character design and animation, alongside her interesting personality and powers she is very popular in fandom, to a point that many only watch this movie for her.
Evil Is Cool: It wouldn't be an exaggeration to say plenty of people watch this film just for Eris.
Harsher in Hindsight: Dreamworks' "Traditional Animation is Dead" line in response to this movie bombing can definitely be seen in a new light considering allthebox-officeduds DreamWorks has had in recent years. Unliketheircompetitors, a single low grossing movie is enough to pull stockholder support from the company.
One True Threesome: There is some rather heavy subtext between Sinbad/Marina/Proteus. While Proteus/Marina and Sinbad/Marina are both canonical, the two men bear no jealousy towards each other. Proteus blindly trusts Sinbad to save his life, and they spend a lot of time embracing and staring into each other's eyes. Really, the only reason Proteus couldn't follow them to sea was because of his duties as Prince of Syracuse. There is nothing to say Marina loves Sinbad more than Proteus, since she wanted to sail the sea long before the events of the film.