Well, I'm not sure of specific 'Harry Potteradipted by Voldemort' fanfics off the top of my head. But you can try looking on some popular fanfic websites like FanFiction.net or Archive of Our Own. They usually have a wide range of fanfics, and you might be able to find what you're looking for by using relevant search terms.
Perhaps a major plot twist could be that Voldemort actually has a change of heart after 'adapting' Harry. He sees something in Harry that makes him question his own evil ways. This could lead to a strange alliance between the two where they try to find a new way to rule the wizarding world that is less about destruction and more about a new form of magic governance. It would be a very unexpected turn considering Voldemort's character in the original series.
One popular 'harry loves voldemort' fanfic is 'The Unlikely Bond' on FanFiction.net. It explores a very different relationship dynamic between the two characters, where Harry starts to see beyond Voldemort's evil exterior due to some mysterious magical connection.
One popular Bellatrix Voldemort fanfic is 'The Darkest Bond'. It delves deep into their complex relationship within the dark wizarding world. Another great one is 'Shadows of the Dark Lord's Follower' which shows Bellatrix's unwavering loyalty to Voldemort in very interesting scenarios.
One possible 'Harry saved by Voldemort' fanfic could be one where Voldemort has a sudden change of heart due to some long - forgotten magic or prophecy. Maybe he realizes that Harry's life is crucial to maintaining the balance of the wizarding world in a way he hadn't foreseen.
Well, a great voldemort captures harry fanfic is 'The Snare of the Dark Lord'. In it, Voldemort uses a powerful dark spell to paralyze Harry and capture him. The story then delves into Harry's internal struggle as he tries to find a way to break free. Another fanfic could be 'Imprisoned by Voldemort' which focuses on the psychological battle between Harry and Voldemort while Harry is held captive. And 'Under Voldemort's Control' is also a good one where Voldemort tries to turn Harry to the dark side while having him captured.
I'm not sure specifically which 'Harry Spreads for Voldemort' fanfics are popular. You could try searching on major fanfic platforms like Archive of Our Own or Fanfiction.net and look for ones with high ratings and a lot of reviews.
There could be a fanfic where Harry is tricked into believing that Voldemort is the only one who can save the wizarding world from a greater threat. For example, a new, more powerful dark force emerges and Voldemort convinces Harry that they need to join forces. In this type of fanfic, Harry would gradually turn towards Voldemort's side as he is deceived by false promises.
One interesting Voldemort fanfic could be those that explore his early years before he became fully evil. Maybe a fanfic where we see his time at Hogwarts and how his dark thoughts started to form. Another could be a story where Voldemort has a chance at redemption, which is quite a different take on his character. And there are also fanfics that focus on his relationship with his Death Eaters in more depth, showing the power dynamics and loyalty within the group.
One popular 'Harry kills Voldemort' fanfic might be the one where Harry uses a unique spell combination that he discovers in an ancient magic book hidden in Hogwarts. This spell gives him an edge over Voldemort's dark magic.
One popular one might be 'The Stolen Boy' where Harry is taken from Voldemort's clutches in a very unexpected way. It has a unique plot where the wizarding world has to deal with the consequences of Harry being in a different situation than in the original story.