Powers of Unites

You probably loved a movie, television series, cartoon, novel, or even a story from your grandmother, so what about if you suddenly found yourself in another magical world?
After War World III happened from an evil organization, people from around the world scattered and formed groups to fight the organization. Once a group of resistance fought with their enemy, a strange portal appeared and swallowed them leading them to an immersive and vibrant world full of magic, powers, and fictional characters. what secrets and surprises does this world have for these resistants?
(note: this story was created since I was 9 years old, so it may includes some references from different kind of resource).