Yes, it can be quite popular in certain fanfiction communities. The idea of a relationship with a 'bad boy' character often adds an element of excitement and drama, and the concept of pregnancy can introduce complex storylines.
Gray Fullbuster can often be portrayed as a bad boy in fanfiction. His cool and sometimes aloof attitude, along with his stripping habit which can be seen as a bit of a rebel trait, makes him a popular choice. Another one could be Gajeel Redfox. He was originally an enemy but joined Fairy Tail. His rough past and tough exterior give him that bad boy vibe.
Well, a major theme in this type of fanfiction is the exploration of the dark side. The bad boy and bad girl often have a side to them that is not so clean or proper. There's also the theme of power struggle within their relationship. Sometimes they compete with each other, and other times they team up. Another common theme is the search for identity. As they are different from the norm, they are constantly trying to figure out who they are, and their relationship plays a part in that discovery.
One example could be 'Unexpectedly Yours' where the bad - boy character has an unexpected encounter with the girl that leads to pregnancy. This kind of plot often involves a lot of drama and character growth as they deal with the situation.
Well, a typical theme is the unexpectedness of the pregnancy. It throws their lives into chaos and they have to figure things out. There's also the theme of love against all odds. Despite the bad boy's reputation and the difficult situation, love still blossoms. And of course, the theme of facing consequences, like dealing with family reactions and future plans.
Another common ending is that they face a lot of external challenges like family opposition or financial difficulties. But through their love and determination, they overcome these obstacles. The bad boy learns to be more reliable, and they start a new life together, with the pregnancy being a turning point that strengthened their relationship.
He is likely to be a complex character. He may seem tough on the outside with a bit of a rebellious streak. Maybe he has a leather jacket and rides a motorcycle kind of look.
One popular bad boy fanfiction story could be about a rebel in a high school setting. He's the one who breaks all the rules but has a heart of gold deep down. For example, he might stand up to the school bullies in his own rough way.