I'm not sure which specific 'akatsuki tobi love story' you are referring to. Akatsuki is a group in Naruto. Tobi was a character in it. Maybe it could be a fan - made love story between a member of Akatsuki and Tobi. Without more context, it's hard to tell the exact story.
One great 'Tobi Obito x OC Fanfiction' is 'The Hidden Bond'. It has a really interesting plot where the OC has a unique connection with Obito that gradually unfolds throughout the story. The character development is well - done, especially for the OC as she starts off as a shy girl but grows into a strong kunoichi through her experiences with Obito.
Well, 'Tobi's Redemption' is an interesting 'akatsuki tobi fanfic'. It shows a different side of Tobi, perhaps a more sympathetic one. 'Akatsuki Tobi: The Untold Stories' is also good as it reveals some backstories that are not shown in the original series. And don't forget about 'Tobi's Alliances' which focuses on his relationships and alliances within the Akatsuki.
Well, if we go by the name, the main character is Tobi for sure. And as for the other part of the love story, it could be any of the Akatsuki members. It could be Konan, who has her own charm and powers. Or it could be someone like Kisame, though that would be a really strange pairing. But in fan - made stories, the possibilities are endless when it comes to pairing Tobi with an Akatsuki member.
One common theme is redemption. Since Obito has a dark past in the Naruto series, in many fanfictions, the OC helps him find a path to redemption. Another theme is love against all odds. Their relationship often has to overcome obstacles like Obito's loyalty to his original goals or differences in their villages.
To write an 'akatsuki tobi fanfic', start by brainstorming ideas. Think about what makes Tobi unique. Maybe you want to explore his connection to other Akatsuki members more deeply. You should also research the Akatsuki as a whole. Their goals, their hierarchy, etc. When writing, use vivid descriptions to bring the story to life. For instance, describe Tobi's movements and his signature jutsu. Also, make sure your story has a clear theme, like loyalty or betrayal.
One possible interesting plot could be Obito revealing his true identity to the Akatsuki members. It would create a huge shock and change the dynamics within the group.
Some might see it as an opportunity to get closer to understanding Tobi's motives. Hidden Leaf Village, Naruto's home, would be torn between trying to save him and having to protect themselves from him. The younger generation who looked up to Naruto would be heartbroken and confused, and the older shinobi would be worried about the future of the ninja world with Naruto in this new, dangerous state.