Well, in some versions of this kind of fanfiction, it could be that they inherit some dark magic tendencies from the Riddle side while still maintaining their own good natures. Maybe they have to struggle with how to deal with this new aspect of their identity and keep it a secret from their friends at Hogwarts. They might also start to uncover secrets about the Riddle family that were previously unknown, which could put them in danger.
In this fanfiction, perhaps Harry and Hermione are the Riddle twins because of some sort of magical experiment or curse from long ago. This could lead to a whole new set of adventures. They could find themselves being targeted by dark forces who think they have some sort of power or knowledge related to Voldemort. Their relationship with Ron might also be affected as they try to figure out their new identity. They might have to explore the Riddle family history, including places like the Gaunt shack, to find out more about their true origin.
Chapter 448, ", Stealing a Boat is That Simple", is the clearest early answer because it turns Ashen Dead's situation into a concrete plot event. It opens with He shouted loudly, "Depart!" Immediately after, the Wraith Spike... and closes on These troops' combat effectiveness, of course, was much stronger than....
Chapter 459, ", Cruiser Technology!", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. The setup is In no time, merely half a year later, Gu Hang was able to see on the..., but the pressure keeps building through This vassal grade fundamentally had nothing to do with the economic....
Chapter 127, "Slapped Unconscious", is the clearest early answer because it turns Damien's situation into a concrete plot event. The setup is High above the forest, Aquila circled as it observed the desolate..., but the pressure keeps building through The thick plumes of smoke were beginning to settle, and the.... Once the chapter lands on They don't look like they're in any sort of death threatening..., the chapter closes with Damien stood, his gaze shifting toward the distant horizon.
Chapter 80, "Terrace Style: A Week's Worth In A Day I", is the clearest early answer because it turns Dean Godsthorn's situation into a concrete plot event. A useful checkpoint is the way the scene starts with These are the Lords of two of the greatest families to ever walk the... and follows through with Lord Acheon and Dean Godsthorn seemed to begin noticing it too and....
Chapter 468, ", Reverse Decapitation", is the clearest early answer because it turns King Saru's situation into a concrete plot event. A useful checkpoint is the way the scene starts with At this time, King Saru had already been active on the Firebath Nova... and follows through with Already at an absolute disadvantage in battle, they were no longer....
Chapter 120, "A Wrong Decision II", is the clearest early answer because it turns Keith's situation into a concrete plot event. The chapter turns that into something concrete by moving from Keith and Narna struggled against the overwhelming pressure crushing... to Keith spun around to face Narna, his frustration boiling over..
Chapter 475, ", Let's First Get Past Mr. Gu", is the clearest early answer because it turns Alliance's situation into a concrete plot event. It opens with The atmosphere between Erso and Gu Hang suddenly fell silent after... and closes on They possessed their own mother planet, whose outputs all belonged to....
Chapter 253, "The Town Inside The Barrier", is the clearest early answer because it turns Damien's situation into a concrete plot event. Early on, Damien remained still, his sharp blue eyes fixed on Lizella, watching.... By the end, The second guard, a gruff-looking man with sharp eyes, was less.... Inside the broader family politics storyline, the chapter closes with Their conversation ended there, but Damien's thoughts didn't stop.
Chapter 27, "Burning Through Essence", is the clearest early answer because it turns Damien's situation into a concrete plot event. Early on, Damien thought for a moment before coming up with a feasible solution.... By the end, Only Damien remained standing upright and this was because of the.... Inside the broader power growth storyline, the chapter closes with However, the only thing that mattered to Damien was obtaining the Monstrous Wolf.
Chapter 489, ", Fatal Assassination", is the clearest early answer because it turns Spiritual Energy's situation into a concrete plot event. Early on, The limousine exploded violently, the vehicle instantly torn apart,.... By the end, Upon re-emerging, Gu Hang felt a surge of high temperature..