One possible aspect of this fanfiction could be exploring the relationships between Adrien, Marinette, and Luka. Maybe it's a story where their personalities merge in some magical or scientific way. For example, their combined traits could lead to a new superhero or a character with a very unique set of skills and emotions.
The theme of hidden identities also exists. Given the context of the Miraculous world they live in, sometimes their identities as heroes or normal teens are explored in relation to their relationship. It adds an extra layer of mystery and drama to the fanfiction, making it more engaging for the readers.
There could be a lot of internal conflict. Marinette might be used to her shy yet determined self, and Adrien his more reserved but princely nature, and Luka his laid - back attitude. When merged, they'd have to reconcile these differences within the new entity. This could lead to a very character - driven story as they learn to function as one.
There's also 'The Bluebell and the Ladybug'. In this fanfic, the author focuses on the slow - building romance between Luka and Marinette. It has really detailed descriptions of their interactions, like the way Luka looks at Marinette with such adoration that makes your heart flutter.
Hard to say. To determine if Manny is real, one would need to closely examine all the elements and information presented in the Luka Magnotta story. It could be a fictional character or based on a real person with some alterations.