Sure, there are. When searching for them, it's important to read the tags and summaries carefully. Some fanfictions might include other elements from the Fire Emblem series, like other characters' perspectives or different plotlines that intersect with the relationship between Female Kris and Marth. You might also want to check the reviews to see if other readers liked the story.
One theme that often shows up is the idea of unity. Ike and Marth coming from different parts of the Fire Emblem world, but in fanfictions, they are often united for a common goal. It could be saving a world, or fighting against a powerful dark force. Also, loyalty is a big one. They are loyal to their friends and people in the games, and in fanfictions, this loyalty extends to each other as they face various situations together. And sometimes, there's a bit of a hero - worship theme, where one might look up to the other's skills and reputation.
Adventure is also a popular theme. Writers might send them on quests together, facing challenges and enemies. This allows for the exploration of their characters as they rely on each other's strengths. For example, Marth's strategic mind combined with Ike's combat prowess can make for some exciting adventure scenarios.
The theme of mutual admiration also frequently appears. Roy might admire Marth's experience and wisdom, while Marth could be impressed by Roy's determination and growth. This admiration can be the basis for a deeper emotional connection in the fanfictions.
One place to find 'fire emblem marth x ike fanfiction' could be fanfiction.net. There are often a variety of works there that might cover this pairing. You can search using the relevant tags and keywords to narrow down the results.
One common theme is self - discovery. The original characters often have to figure out their place in the world of Fire Emblem Warriors. They might start as outsiders and gradually find their purpose.
Chrom is often a popular character. His leadership skills and strong sense of justice make him a great protagonist in many fanfictions. He can lead the charge in battles and inspire his comrades, which is always an exciting aspect to write about.
Another good storyline might involve a character's redemption arc in the Fire Emblem Warriors fanfiction. Maybe a villainous character realizes the error of their ways through interactions with the heroes. They then turn against their former allies and fight for a new cause, which would add depth to their character and create new plot twists.
One possible plotline could be them meeting during a difficult battle and having to rely on each other to survive. This could then lead to a deeper connection and the start of a romantic relationship. Another could be that they are from different kingdoms but are brought together through diplomatic means and gradually fall in love as they get to know each other's cultures.