A lot of Portal Chell pregnant fanfictions play with the idea of the father. Some might have it be an OC (Original Character) that was also a test subject, and they met during their trials. The story could then revolve around how they reunite and deal with the news of the pregnancy, all while still being in the strange and dangerous world of Aperture Science.
Family is also a common theme. Since Chell has been mostly alone in the Portal games, the pregnancy forces her to think about creating a family. This can lead to her reflecting on her own past and the lack of a family she had before. Some fanfictions explore how she might try to create a loving and nurturing environment for her child, even in the midst of the insanity of Aperture Science.
The back story of Chell in Portal involves her being a test subject in the Aperture Science facility. She wakes up in a strange, sterile environment and is forced to participate in various portal - related tests. The facility, run by the malevolent GLaDOS, is full of dangerous and mind - boggling test chambers. Chell's main goal is to survive and escape this crazy place.
Portal Chell fanfiction can be really diverse. Without the inappropriate 'hardcore lemon' aspect, there could be stories that explore her backstory more deeply. For example, how she ended up in the Aperture Science testing program in the first place. There could also be fanfictions that focus on her mental state during the testing, like how she copes with the isolation and the constant danger she's in while still trying to find a way out of the facility.
The key elements include Chell as the test subject, Aperture Science as the setting, and GLaDOS as the main obstacle. Also, the portal technology which is central to all the tests she has to go through.
In 'Portal 2' fanfic, Wheatley and Chell have a complex relationship. Wheatley starts as a somewhat helpful, if bumbling, character. He's supposed to assist Chell in her test chambers, but his actions often lead to chaos. Their relationship is full of humor at first, with Wheatley's silly remarks and Chell's silent but determined reactions. However, as the story progresses, Wheatley's actions take a more sinister turn when he gets power - which creates a rift between them. Overall, their relationship is a key aspect that drives much of the fanfic's drama and plot twists.
You can try fanfiction platforms like Archive of Our Own (AO3). It has a wide range of Portal fanfiction and has strict rules against inappropriate content. So, you are likely to find many stories about Chell there that are family - friendly and focus on the more interesting aspects of the Portal universe.
Wheatley is very significant in the 'Portal 2' Wheatley x Chell fanfic. He serves as a source of both humor and conflict. His bumbling nature at the beginning makes for some funny moments, especially when contrasted with Chell's more serious and determined personality. Later, when he becomes a villain of sorts, he drives the plot forward by creating obstacles for Chell. His character development, from a seemingly harmless sidekick to a powerful antagonist, is a major factor in the fanfic's overall narrative arc.
One great 'Wheatley x Chell' fanfic is 'The Unlikely Bond'. It beautifully explores their relationship post - Portal events. The author does a wonderful job of showing Wheatley's growth and his newfound understanding of Chell, and how Chell might come to see him in a different light.
One popular Addison pregnant fanfiction could be where it explores her journey through pregnancy with a lot of emotional turmoil. It might focus on how she deals with the changes in her body and her relationships. For example, in some fanfictions, she might struggle with her career while being pregnant.
One great Lisbon pregnant fanfiction could be about how the team in 'The Mentalist' reacts to Lisbon's pregnancy. It might show Patrick Jane being overly protective or the team pitching in to make things easier for her at work. Another could focus on Lisbon's own thoughts and fears during the pregnancy, like how she balances her tough job with the new life growing inside her.