The Injustice Game Story is centered around a twisted version of the DC universe. Superman, after the death of Lois Lane, becomes a dictator - like figure. He starts to enforce his own version of justice which many heroes find unacceptable. Batman, being the strategist he is, tries to assemble a team to oppose Superman. The story shows how far a hero can fall and how others will rise to stop them when their actions cross the line.
The main characters are Superman and Batman. Superman is a key figure as he is the one who changes and becomes a sort of antagonist. Batman is the main force opposing him. There are also other characters like Wonder Woman, who is initially on Superman's side but later has her own doubts. Flash, Green Arrow, and Harley Quinn also play important roles in the story, each with their own motives and actions.
The Injustice story is centered around a world where Superman has become a tyrant. In this alternate reality, the Joker tricks Superman into killing Lois Lane and their unborn child, which drives Superman over the edge. He then starts to enforce his own brand of justice, leading to a conflict with other heroes who oppose his dictatorial ways. Batman, being one of the main opponents, forms a resistance and tries to bring back the true sense of justice. There are also elements of different characters' moral struggles as they choose sides in this great divide between Superman's regime and the resistance.
In general, the Injustice comics are considered canon to the game. They often provide additional background and depth to the game's universe, filling in plot holes and enriching the characters' arcs.
The Injustice game has a resemblance to the comics. It features familiar characters and plot points, but also adds some unique elements and gameplay mechanics to stand out.
The main plot points include Superman's dictatorship, Batman's resistance, and the introduction of new threats. Also, the conflict between heroes who support Superman's regime and those who oppose it.