I'm sure there are. The Twilight saga has a huge fan base, and fanfiction writers love to play with different scenarios. Bella's character is central to the story, and her relationship with vampirism is a key aspect. A story where she turns into a vampire as a result of suicide could be a way to explore deeper emotions, different character arcs, and new relationships within the Twilight universe. However, such a topic can also be quite dark and might be treated with different levels of sensitivity in different fanfictions.
In many cases, Morbius isn't considered bad. His character is complex and has various motivations and actions that can't be simply labeled as bad. It's more nuanced than that.
In the comics, Morbius is a complex figure. He struggles with his newfound vampiric nature and often finds himself at odds with both heroes and villains. His powers include enhanced strength, speed, and the ability to fly, but his condition also brings moral and ethical dilemmas.
It depends on your preferences. Some fans think Morbius is great in the comics for his unique powers and complex character development. But others might have different opinions.