One common theme is self - discovery. The male OCs often have to figure out who they are in the context of the Underground world. For example, they might discover hidden powers or aspects of their personality. Another theme is friendship. They form bonds with the canon undertale characters, like befriending Sans or Papyrus.
Redemption can also be a theme. The male OC might have made mistakes in their past and are trying to make up for it in the Underground. Also, the theme of heroism is quite prevalent. They often take on challenges to save the Underground or help the monsters in some way. For instance, they could be fighting against a new threat that emerges in the Underground. This is shown in many fanfictions where the male OC uses his unique abilities to protect the weak and uphold justice.
Another common theme is self - discovery. The OC, being a new character in the Undertale universe, often goes through a journey of self - discovery. Papyrus can play a role in this, either by being a guide or by being part of the situations that make the OC learn more about themselves. In some fanfictions, the OC discovers hidden powers or aspects of their personality while interacting with Papyrus.
One common theme is friendship. The OC often forms a strong bond with Sans, going through various adventures together. Another theme is self - discovery. The OC might be on a journey to find out who they are in the context of the Undertale world.
Another theme is the struggle between good and evil. The ocs can be faced with moral choices, whether to side with the more 'good' characters in Undertale or be tempted by the 'evil' forces. This adds depth to the story and makes it more interesting.
One common theme is self - discovery. The monster OCs often start out not really knowing who they are or what they can do, and then through their adventures in the Underground, they learn more about themselves. For example, they might discover hidden powers or a new purpose in life.
Friendship is also a big theme. The undertale characters already have strong bonds, and in the ABDL fanfiction, these bonds are often tested and strengthened through the unique situations. They support each other in dealing with the new elements of ABDL in their world.
Well, mystery is a big one. Given that 39 clues is centered around mystery, it's often incorporated into the Undertale setting in these fanfictions. Also, friendship and cooperation. Just like in the original works, the characters in the fanfiction might team up to solve problems or face challenges together. And sometimes, there's a theme of self - discovery as the characters navigate through the combined worlds of 39 clues and Undertale.
In 'Undertale Pregnant Sans' fanfiction, a frequently seen theme is the relationship dynamics. How Sans' relationships, whether it's with his friends or family (if applicable in the fanfiction's interpretation), are affected. There might also be themes related to the challenges he faces during the pregnancy, like dealing with potential threats in the Underground while being in a vulnerable state. Also, some fanfictions might explore the idea of Sans preparing for the new life that's coming, which could involve everything from gathering resources to making emotional preparations.
One common theme is self - discovery. Since Frisk is in a strange world, she often has to figure out who she is and what she stands for. Another theme is friendship. Female Frisk forms bonds with the monsters she meets, which is a central part of many fanfictions.
Another theme is friendship. Chara might form new friendships with other characters in the Underground. These relationships help them to grow and become a better version of themselves. It's about how positive human (or monster) connections can influence Chara's transformation.
One common theme is the exploration of different worlds. Since Harry Potter has Hogwarts and the wizarding world, and Undertale has the Underground, fanfictions often focus on how characters move between and adapt to these different settings. For example, a character from Harry Potter might be confused by the rules in the Underground at first.