Enjoyment is not the same as idolatry
The Bible does not give a list of permitted films, comics, or fictional heroes. Paul taught that Christians have real freedom, while also warning that not everything people may do will actually help them or build them up (1 Corinthians 10:23). So being a fan of Superman, Spider-Man, Wonder Woman, or another hero is not sinful simply because it is fiction.
Superhero stories often explore costly choices, loyalty, courage, forgiveness, and the fight against evil. Those themes do not replace the gospel, and fictional heroes are not saviours. Still, Christians need not avoid every story that is not a Bible story. The question is whether your enjoyment stays in its proper place.
All things are lawful for me, but all things are not expedient: all things are lawful for me, but all things edify not.
Let what you watch shape you well
Not all superhero fiction is alike. One film may be light-hearted adventure, while another may dwell on cruelty, sexual content, occult practices, revenge, or hopelessness. Paul encourages believers to set their minds on what is true, honourable, just, pure, lovely, and worthy of praise (Philippians 4:8). That gives a helpful direction, even when a choice is not perfectly simple.
Ask yourself honestly: does this leave me more fascinated by violence than bothered by it? Does it feed lust, fear, anger, or cynicism? Can I watch it with a clear conscience before God? If a particular series or character repeatedly pulls you in an unhealthy direction, walking away may be wise, not restrictive.
Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things.
Freedom includes responsibility
Paul also says that whatever Christians do, even ordinary things like eating and drinking, should be done for God's glory (1 Corinthians 10:31). That does not mean every comic must carry a spiritual lesson. It means your entertainment, like the rest of life, belongs under Christ's care.
Pay attention to what has mastery over you. If binge-watching, collecting, online arguments, or fandom spending begins to crowd out prayer, relationships, work, generosity, or gathering with God's people, the issue may not be superhero fiction itself. It may be that a good enjoyment has become too important. Christians are called not to be mastered by anything (1 Corinthians 6:12).
Whether therefore ye eat, or drink, or whatsoever ye do, do all to the glory of God.
Respect different consciences
Faithful Christians may draw different lines. One person may comfortably enjoy a superhero film, while another avoids it because of its content or because it troubles their conscience. Romans 14 calls believers not to despise or judge one another over disputed matters, and it warns against acting against conscience (Romans 14:3, Romans 14:23).
So you do not need to feel guilty for enjoying superhero fiction with gratitude and self-control. Nor should you pressure someone else to watch what they believe they should avoid. Test what you take in, hold on to what is good, and step back from what draws you towards evil (1 Thessalonians 5:21-22).