One idea could be exploring how Hellboy and Liz prepare for the baby in a world full of supernatural threats. They might have to seek special protection for the unborn child from their enemies.
Another plot could be that Liz's pregnancy gives her new and unexpected powers. As she's carrying Hellboy's child, there could be a unique demonic or magical energy transfer that changes her abilities, and they have to figure out how to control it together. This could also attract unwanted attention from both the human and supernatural worlds.
A possible plot is that Hellboy and Liz are worried about the nature of their child. Given Hellboy's own origin and the fact that he is a demon - like being, they are concerned about what the baby will be like. They could start a journey to find answers, perhaps consulting wise old creatures or looking into ancient prophecies related to their kind.
One idea could be that their babies inherit unique powers from both parents. For example, they might have Hellboy's strength and Liz's ability to control fire, but in new and unexpected ways. Maybe they use these powers to protect the world from a new, unknown threat that the regular heroes can't handle.
One possible fanfiction could be about how Hellboy and Liz deal with the challenges of impending parenthood in a world full of supernatural threats. They might have to protect their unborn child from various evil forces that are attracted to the power of their family.
One idea could be that Hellboy is somehow transported to the Naruto universe. He could team up with Naruto and the others to fight a common enemy, like an ancient demon that threatens both their worlds.
Well, in many fanfictions, the relationship is tested in new ways. There could be conflicts within the Bureau for Paranormal Research and Defense about Liz's pregnancy. Some might be worried about the potential power of the baby. This external pressure can either bring Hellboy and Liz closer together as they face it as a united front, or it can create some tension in their relationship as they try to deal with different opinions.
There could be. Fanfiction writers love to mix and match different characters from various shows and movies. However, the availability of really good 'hellboy and liz lemon fanfiction' might depend on how popular the idea of combining these two is among the fanfiction writing community. It's also possible that it's a more niche combination, so you might have to dig a bit deeper on fanfiction platforms.
Their relationship could grow deeper as they face the challenges of impending parenthood together. They'd have to communicate more about their fears and hopes for the future. For example, Liz might be worried about how Hellboy's world will affect their child, and they'd need to have long talks about it.
There are many possibilities. For instance, in a post - Homecoming scenario, Liz comes back to town and she has changed a lot during her time away. Peter has also grown as Spider - Man. They meet again and there's a spark of their old feelings but also new challenges. Maybe there's a new villain in town who targets Liz to get to Peter. Or they could be involved in a community project together where Peter has to balance his superhero duties with his time with Liz. They could also have an adventure in an alternate dimension where they have to rely on each other more than ever to get back home.
One plot idea could be that Liz discovers Peter's identity as Spider - Man in a really unexpected way. Maybe she accidentally stumbles upon his suit while looking for something in his room. Another could be that they team up to solve a mystery in their school that the police can't figure out, using Peter's powers and Liz's intelligence.
One common theme is sacrifice. Given their dangerous line of work, a lot of fanfics will have one or both of them sacrificing something for the other. Also, the theme of acceptance is there. Hellboy's appearance and Liz's powers are things that they might have to accept in themselves and in each other more fully in fanfiction stories. And of course, there's the adventure theme as they often go on quests together in these stories.
One possible plotline could be that Liz Lemon accidentally stumbles into Hellboy's world while looking for inspiration for a new TV show. She then has to deal with all the supernatural chaos around her with Hellboy as her guide.