Well, that can vary greatly depending on the fanfiction. Some might create an original warlock character for this purpose, while others might draw from existing characters in the related fictional universe and give them this role. Without knowing the specific fanfic, it's hard to say for sure.
Maybe it's a new character introduced just for this plot twist. This would add an element of mystery and new drama to the story.
The main characters are Clary and Jace. Clary is a strong - willed character, often in the middle of adventures in the Shadowhunter world. Jace is a skilled Shadowhunter, and together they form a central couple in this fanfiction, especially with the new situation of Clary being pregnant.
The Seelie Queen could be an antagonist. She might see the unborn child as a threat to her power or a valuable asset to control. So, she could try to manipulate Magnus and Clary throughout the pregnancy.
In this fanfiction, the two main characters are Jonathan and Clary. Jonathan's character might be developed further as he adjusts to the idea of being a father. He may have to make sacrifices and grow in ways he hadn't expected. Clary, as the pregnant one, is likely to be the focus of much of the story's emotional core. She'll be dealing with hormonal changes, fears about motherhood, and the added pressure of having a baby in a world filled with danger and magic.
The Lightwood parents could also be part of the story. They might initially be hesitant or have concerns about Jace and Clary having a baby so young in the Shadowhunter world, but later come around and offer their support, perhaps in terms of providing a safe haven or sharing their wisdom about raising a Shadowhunter child.
I'm not entirely sure if there is a specific 'Jace Superstar Clary Pregnant Fanfiction'. However, considering how creative fans can be, it wouldn't be a surprise. Some fans like to explore different life situations for their favorite characters. You could also check out Tumblr, as sometimes people share links to interesting fanfictions there.
The 'Clary is pregnant fanfiction' might have a plot where the pregnancy is unexpected. Clary could be in the middle of some important events in her life, like her career or studies. Now she has to re - evaluate everything. Her friends and family may have different reactions, some being supportive and some being worried. This could lead to a lot of emotional turmoil and character development for Clary as she navigates this new phase of her life.
Obviously Clary herself is the central character. Jace is also very often involved as he is Clary's love interest. Alec and Isabelle Lightwood might also play important roles. They could be the ones helping Clary through her pregnancy, giving her advice or protecting her from any threats.
In this fanfiction, Clary is likely a newly introduced and attractive female character. However, without more context from the specific fanfiction, it's hard to say more about her personality or role in the story.
The main characters are obviously Clary and Jace. Clary is a strong - willed and powerful young woman, and Jace is a skilled Shadowhunter. In the context of the pregnant fanfic, they are the couple expecting a baby.