Jake Sully is one of the lead characters in the film. Suffering from complete paralysis of the limbs, he chances upon the opportunity to be the hybrid Avatar in place of his deceased twin brother. He is thereby able to make use of his functioning mental capability with the genetically engineered body of Na’vi individual.
Jake Sully is heroic in many ways. First of all, his behavior is sincere and honest. He keeps his word and does not indulge in wrongdoing. He is largely faithful to his superiors stationed in Pandora. He only rebels against them when he feels outraged by their greed. In other words, human greed to obtain the precious mineral unobtanium becomes very desperate and they even resort to ready use of violence to achieve this end. This enrages the fair and just minded Jake. So to save his own morality he sides with the alien race of Na’vis and fights against humans.
That Jake Sully’s intentions were benevolent and morally upright is proved toward the end of the narrative. The Na’vis are eventually convinced of his goodness. Through the mystic spirits resident in Hometree, they accept him as a member of their own race. The elders of the community are also able to see his genuine love for Neytiri.
Hence, Jake Sully’s mission to Pandora, which started with a commercial objective of gathering unobtainium, is transformed into a personal mission in the end. By taking new life in the manufactured body of a Na’vi, Jake is able to regain his lost physical faculties. More importantly, by being accepted as a member of an environmentally conscious race, he has elevated his own standing. It is such a fitting and romantic outcome that Jake Sully truly deserved.