Well, akumas typically have a back story related to a source of evil or a corrupting influence. It could start with a character who has some sort of inner turmoil or a tragic past. This internal struggle makes them vulnerable to the influence that turns them into an akuma. For example, if a character has lost a loved one and is filled with grief and anger, that might be the trigger for the akuma transformation, leading to a whole new set of actions and a role in the story as an antagonist.
One key element is negative emotions. They are the fuel that often drives the creation of an akuma. Another is some sort of external influence, like a dark power or a malevolent entity that takes advantage of the person's weakened state due to negative emotions. And the transformation itself is also an important element, as it marks the turning point from a normal being to an akuma with different abilities and a new role in the story.
Well, the Akuma origin story could be related to ancient curses. Maybe it was a result of a forbidden ritual gone wrong. In certain tales, Akuma is seen as a manifestation of the darkest human emotions. It gains its power from fear, anger, and hatred, and over time, it has evolved into a terrifying force that preys on the weak and the vulnerable.
Well, without more context, it's hard to say precisely. 'Akuma to love story' could potentially be a story that explores the themes of love and redemption. Perhaps the 'akuma' is a fallen character who finds love and through that love begins to change and find a new path in life. It could also be a more traditional love story set in a world where 'akumas' exist, and the couple has to face the prejudice or danger associated with one of them being an 'akuma'.
One key element is often the source of its power, which might be dark magic or negative emotions. Another is its initial form or state before becoming the full - fledged Akuma. For example, it could have been a normal being that was corrupted.
Since I don't have specific information about this 'akuma to love story', it's difficult to say. But it's likely that there is a character who is an 'akuma' or has some connection to the 'akuma' concept, and then a love interest. Maybe there's a brave hero - type character who falls in love with the 'akuma' against all odds.
Harry Potter himself is a likely candidate. Given his heroic nature and the need to constantly fight against dark forces, an Akuma no Mi could be a great addition to his arsenal of skills. It would give him new ways to protect his friends and defeat his enemies.
Sasuke. If Sasuke had an Akuma no Mi power, like the Goro Goro no Mi (Rumble - Rumble Fruit), it would make him even more formidable. He could use lightning - based attacks from his ninjutsu in combination with the electrical powers of the fruit. His already brooding and powerful character would become even more complex and dangerous.
I'm not sure if there is a specific fanfic exactly like that. There are so many Naruto fanfics out there, and while some might involve Naruto having an interest in Akuma in some creative crossovers, it would take some serious searching through fanfic platforms to find one.
Another place is FanFiction.net. There are some really good and unique 'Akuma no Riddle' fanfics there. Just use the search bar and type in 'Akuma no Riddle' to find relevant stories.