Hallow's War

Halloween is interpreted differently by many people. Some Christians see it as a celebration of deceased saints. Others couldn't care less. But deep down in the depths of Hell, Satan sees it as his rightful day.
Satan is infuriated that a majority of humans celebrate Halloween as a day of pop culture and consumerism. They're dressing up in character costumes, eating sugary candy, and none of it relates to Satanism. So in his rage, he gives the earthly world a challenge:
"My armies of demons will pillage Earth, leaving blood and fire in their path of destruction. But you humans may stand a small chance. Your costumes will gain true powers, and you must use those powers to fight my horde of sin. If you succeed, you may keep your holiday. But if my armies prevail, no longer will your prayers to God save your troubled souls."
Humanity has 666 hours to fight off 666,666,666 demons... with only 666 seconds to prepare. Our main character is Johnny, who is dressed as his self-created superhero Rayblazer. His friends join him in the fight, including Ryan as Luke Skywalker, Jackson as Master Chief, Logan as Eren Jaeger, Daniel as RoboCop, and Ethan as Harry Potter. And there are millions of others costumed up and ready to fight too. Will humanity take back Halloween, or will Satan doom them all to Hell?