The snake could be developed as a complex character. It might start as a menacing figure, hissing and showing signs of the old Voldemort's evil. But as the story progresses, it could show vulnerability. For example, when it faces a powerful magical force that it can't easily defeat.
The plot could involve the snake Voldemort having some sort of unique adventure in the wizarding world. Maybe it discovers a hidden magic that even Voldemort himself didn't know about when he was alive. It could go on a journey to find a powerful magical artifact that was once associated with its former master.
The obvious key supporters would be the Death Eaters. They were always loyal to Voldemort. Bellatrix Lestrange would be one of the most prominent ones, being extremely fanatical in her devotion to him.
Maybe it's a completely new character created for the fanfiction. This new character could be from a far - off land, with a different kind of magic that Voldemort is interested in. Their marriage could be a way for Voldemort to gain access to that new magic or territory.
Another option could be a Muggle - born witch. Voldemort might have been intrigued by her in a different way compared to his hatred for most Muggle - borns. But as his views on pure - blood supremacy become more extreme, she can't bear to be with him any longer, and their relationship ends.
It could be Dumbledore. He was always one to oppose Voldemort and a howler from him would be a very interesting plot point. He might use it to taunt Voldemort or to try and make him second - guess his actions.
There are countless 'Harry Potter' fanfictions out there, and while I can't name one specifically about a snake named Voldemort, here's how you can find it. First, go to major fanfiction platforms. On these sites, use the filters if available. Filter for 'Harry Potter' fandom. Then, in the search box, type in the exact phrase 'a snake named Voldemort'. Browse through the results. Some fanfictions might only have a passing mention, but with some patience, you may find one that focuses entirely on this unique concept.
Well, it could be about a hidden snake that was named Voldemort by a dark wizard long ago. Harry and his friends discover it during one of their adventures in the Forbidden Forest. The snake has some sort of dark magic tied to it that Voldemort once used, and they have to figure out how to break the spell.
Harry Potter would likely be one of the main characters. Since Ginny is his love interest in the original series, he would surely be affected by her marriage to Voldemort. He might be the one to try and rescue her or stop the marriage. Ron Weasley, Ginny's brother, would also be important. He would be outraged and would probably be part of any plan to oppose the union.
Snape could also be a character in such a fanfic. His complex relationship with both Harry and Voldemort makes him an interesting addition. He might be in a difficult position, having to keep his cover as a double - agent while also trying to find a way to save Harry without revealing his true intentions to Voldemort.