Adaptation is also a big theme. Since it's a crossover, the characters from one side have to adapt to the rules and environment of the other. For example, a game character in the 'Worm' world has to figure out how to deal with the very different social and power structures there. And in many 'worm gamer crossover fanfiction' stories, there is often a theme of exploration. The characters explore the new world they find themselves in, whether it's a gamer exploring the 'Worm' world or vice versa. They learn about new powers, new threats, and new opportunities, which makes for an exciting and engaging read as the story unfolds over time with new discoveries and challenges." "Answer3": "Conflict is a common theme as well. There are often clashes between the different power systems, like the gamer's skills and the parahuman powers in 'Worm'. There can also be conflict between characters who have different goals or come from different worlds. For instance, a gamer character might want to 'beat the game' while the native 'Worm' characters are more concerned with survival and power struggles within their own world.
One common theme is power - up. The gamer elements usually bring in systems that allow the characters to level up and gain new abilities, which often plays a major role in the story.