One idea could be Ruby discovers she is the Winter Maiden in a moment of great danger. As she tries to control her new powers, she has to face off against Salem's minions who are after the power of the Maiden. Ruby's friends, Weiss, Blake and Yang, are initially shocked but quickly support her in her new role.
One common theme is loyalty. Since Winter is a very loyal character in RWBY, fanfics often explore her loyalty to her superiors, her friends, and her ideals. For example, in many fanfics she has to choose between her loyalty to the military and her loyalty to her friends.
A great Winter RWBY fanfiction might be 'Winter in the Alternate Dimension'. Here, Winter gets transported to an alternate dimension where the rules of Remnant are different. She has to adapt quickly to survive and find a way back home. This could involve her making new alliances and facing off against strange versions of familiar foes. It would be really exciting as it gives a fresh take on her character and the RWBY universe as a whole.
One common theme is the exploration of their different personalities. Winter is often depicted as more rigid and by - the - book, while Qrow is more laid - back. Their interactions based on these differences are often explored. Another theme is the idea of trust. Given their different backgrounds and allegiances, stories often focus on how they come to trust or distrust each other.
In RWBY Winter Futa fanfic, themes of loyalty and friendship might also be common. Winter's loyalty to her comrades or her struggle to maintain friendships in the face of new and challenging situations. And of course, there could be themes related to the RWBY world's overarching battle against evil, with Winter playing a significant role in those fictional battles.
Self - discovery is also a prevalent theme. Weiss has been on a journey to discover who she really is outside of her family's expectations. Winter, too, has her own journey of self - realization, especially in relation to her role in the military and her personal values. Their stories often touch on how they come to terms with their true selves and what they want to achieve in life.
Another theme is duty. Winter is often portrayed as someone very dedicated to her duties, whether it's in the military or as a huntress. Fanfics may show her wrestling with conflicting duties or having to make sacrifices for the greater good.
The theme of sacrifice also appears frequently. Winter is a character who is dedicated to a cause, and in fanfiction, she may be put in situations where she has to sacrifice something dear to her, like her personal relationships or her own safety, for the greater good. This can create a lot of drama and emotional depth in the stories.
There are some great Ruby and Winter fanfictions out there. One might find on fanfiction.net or Archive of Our Own. Some fanfictions focus on their potential friendship, like how Ruby could learn a lot from Winter's discipline. Others might explore a more sisterly bond, given Ruby's relationship with Weiss and Winter being Weiss's sister.
There are quite a few great ones. 'Winter's Apprentice' is really good. It focuses on Ruby learning some new skills from Winter and their relationship evolving from a teacher - student dynamic to a friendship. The story has some really well - written action scenes.