One common theme is the struggle for acceptance. OCs often face challenges in being accepted by the existing characters in the 'Invader Zim' universe, whether it's by the Irkens or the humans.
One idea could be a crossover with 'The Simpsons'. Zim could try to infiltrate Springfield, thinking it's a key Earth location for his invasion plans. Maybe he mistakes Homer for a powerful Earth leader and tries all sorts of wacky schemes to take over the town through him.
In 'invader zim and gaz lemon fanfic', a recurring theme could be the power dynamic. Zim has his alien powers and Gaz has her own unique skills and attitude. Writers may play with how these two interact in terms of power, whether it's a struggle for control or a mutual respect for each other's abilities. Additionally, there might be a theme of self - discovery. As they interact, both characters could learn more about themselves and their place in the world around them.
One common theme is the rivalry between Dib and Zim. It's always a central part of these fanfics as their battle of wits and attempts to outdo each other.
One popular Invader Zim girl fanfic might be those that focus on a female character's adventures in the strange world of Invader Zim. For example, a story where a girl discovers Zim's true identity and has to decide whether to expose him or help him in his bumbling attempts at world domination.
The combination of the unique character of Ayam with the already wacky world of Invader Zim. It allows for new and creative storylines that can range from comical to action - packed.
Often, there's a theme of self - discovery. As Female Zim is a different take on the character, she might be on a journey to figure out who she is in this new form. Also, the theme of adaptation is common. Just like in the original where Zim has to adapt to Earth, Female Zim may have her own unique ways of adapting, whether it's to Earth's environment or to the reactions of the other characters around her. And there's also the theme of power. How does being female change Zim's perception and use of power? This is something that many fanfictions like to play with.
It depends on how you look at it. Some fans consider the comics canon because they continue and enrich the storylines from the show. However, others might have reservations based on personal interpretations.