One common theme is friendship. Since Ruby and Amber are both characters in RWBY, fanfictions often explore how they become friends and support each other. Another theme is the power they possess. Their unique abilities are often highlighted and how they can use them together.
Themes like redemption can also be found. If one of the characters has made a mistake in the past, the fanfiction might explore how they can redeem themselves through their relationship with the other. Additionally, the exploration of their pasts is a common theme. How their respective backgrounds shape who they are and how they interact with each other.
One common theme is leadership. Ruby is a team leader in RWBY, and many fanfictions explore how she grows into that role, like dealing with difficult decisions and inspiring her teammates. For example, in some fanfictions, she has to lead her team through a very dangerous mission where every decision matters.
One common theme is the clash and combination of different powers. Naruto has his ninja powers like jutsus and Amber has her RWBY - related abilities. Another theme is friendship. They often form a bond as they come from different worlds but face common challenges.
One common theme is redemption. Given Amber's complex backstory in RWBY, many fanfictions focus on her trying to make up for past mistakes or events that she was involved in.
Another theme could be acceptance. How her friends and the people around her accept and support her. It might show the growth of relationships within the RWBY universe as they learn more about Ruby's autism. There could also be themes related to Ruby's special interests within the RWBY world, like her weapon or her combat skills, and how her autism influences those interests.
The exploration of their backstories together is also a theme. Writers may create scenarios where Ruby and Cinder's pasts are somehow intertwined, perhaps revealing secrets that change their relationship in the RWBY universe.
One common theme is self - discovery. Ruby often has to figure out who she is in the context of her new family or situation. For example, in many of these fanfictions, she might realize new strengths or weaknesses she didn't know she had.
One common theme could be Ruby facing some sort of emotional coldness or isolation. Maybe she's been through a tough event and has withdrawn from her friends.
A prevalent theme is the exploration of their relationship. This can range from a deep platonic bond to something more romantic in some fanfictions. Also, the theme of loyalty is common. They are loyal to each other as members of their team, and fanfictions will often have situations where this loyalty is tested, like when one of them is in danger and the other has to make a choice to save them.
In Ruby mourning fanfictions, a significant theme is the struggle to move forward. Ruby is stuck in her grief, and the story is about her trying to break free from it. Another common theme is the change in relationships. Her relationships with other characters are often affected by her mourning, either they become closer as they try to support her or they drift apart because she pushes them away.
Another theme is discovery. Ruby discovers new things about herself, her powers, or the world around her through her interactions with Kali. And Kali might also discover new aspects of the younger generation's way of thinking and fighting through Ruby. This mutual discovery helps to drive the plot in many of these fanfictions.