One key element is definitely Ymir's emergence from the chaos of Ginnungagap. Then there's the significance of his body being used to form the world. His bones for mountains, his flesh for land, all these are important elements that show how the Norse believed the world was created from this one giant being. It also implies a certain hierarchy in the cosmos as the later - arriving gods were the ones who shaped the world from Ymir.
One common theme is friendship. Many fanfictions focus on how Ymir and Sasha form a strong bond through shared experiences. Another theme is growth. They often grow as individuals while also growing closer to each other.
The key elements in Ymir's back story include her emergence from the primordial state, which was a time of nothingness and potential. Her physical body being the raw material for the creation of the world, like the sky, the earth, and the seas. And finally, the act of the gods overpowering her, which is a significant part of the power dynamic in Norse mythology.
One common theme is adventure. The male reader and Ymir might embark on a journey together, facing various challenges and foes. Another theme is love and romance, exploring the developing relationship between them. It could start from a chance encounter and grow into deep affection.
One possible fanfiction could be about their adventures together within the walls. Maybe they discover a hidden passage that could potentially change the fate of the Survey Corps. They might face Titans together and in the process, their bond deepens as they rely on each other's skills and instincts.
Well, Ymir was born from the void in Norse lore. Ymir's body was used to create the world as we know it in the mythology. For example, the mountains were made from her bones, the seas from her blood. Her back story is crucial as it sets the foundation for the entire Norse cosmological view.
In a fanfic, Christa and Ymir might find a hidden place within the walls. This place has secrets about the origin of the Titans. As they explore it, they learn more about each other. Christa could discover Ymir's past and understand why she is the way she is. Their story could be filled with mystery and adventure, and in the end, they become even closer friends.
One interesting plot could be Ymir protecting Christa in a dangerous situation within the walls. Maybe when Titans are attacking, Ymir uses her unique abilities to fend them off and keep Christa safe. Another plot could be a story about their friendship growing deeper as they face the secrets of the world together. They might discover something about the origin of Titans that changes their perspective on everything.
Love and sacrifice is also a significant theme. In some fanfics, their love for each other is so strong that they are willing to sacrifice themselves for the other. This shows the depth of their relationship and how much they value each other in the dangerous world of 'Shingeki no Kyojin'.