There's a fanfic called 'Chrom and Lucina: The Unseen Journey'. This one focuses on their journey together. It shows how they support each other in battles and in making difficult decisions. The author does a great job of creating a believable and immersive world for them.
Well - developed characters are essential. The fanfic should stay true to their personalities from the original source. Chrom's bravery and Lucina's precociousness need to be intact. Also, a good plot that ties into the Fire Emblem universe, like dealing with threats to their kingdom, makes for an interesting read.
Love and sacrifice are common themes. Given their story in the game, their relationship can be explored in terms of how far they would go for each other.
There are many great 'lucina x chrom fanfic' out there. You can start by looking on fanfiction websites like Archive of Our Own. Some popular ones often explore their relationship in the context of the game's story, with themes like their journey together and the development of their feelings for each other.
One great Chrom and Lucina fanfic could be 'A Father's Promise'. It beautifully explores their relationship within the context of the game's lore. Another is 'The Bond of Royals' which focuses on their shared responsibilities as leaders and how that affects their personal bond.
Fanfiction.net is also a good place to look for Chrom and Lucina fanfics. There are many users who contribute to this site with their creative works. However, the search function might not be as refined as AO3, so you may need to do some more sifting through the results. But it's definitely worth checking out.
Since I don't have much information on what exactly 'chrom orange' refers to in the context of fanfic, it could be a very niche piece of fan - made literature. It might be that Chrom is a new or relatively unknown character in a particular fandom, and the writer of the fanfic has decided to incorporate the color orange as a symbol, or it could be related to an orange - colored object that is important to Chrom's story in the fanfic. For example, if Chrom is a hero, the orange could be the color of his magic sword or his shield.
Destiny is also a frequently seen theme. Lucina is often on a journey to fulfill her destiny. In addition, friendship is a common theme. She forms strong bonds with other characters in many fanfics. This helps in creating interesting storylines and character development.
One great Link x Lucina fanfic is 'A Bond Beyond Time'. It beautifully weaves their characters together in an adventure where they have to team up to save both their worlds. The author does a wonderful job of showing how their different skills complement each other.
I haven't heard of any specifically popular 'chrom orange fanfic' stories. It might be a very specific or new concept that hasn't gained widespread popularity yet.