Yes, in some RWBY fanfictions, Ruby can be depicted as the Summer Maiden. Fanfiction allows for creative interpretations and alternate storylines, so it's not uncommon to see such a concept explored.
In RWBY fanfiction, if Ruby is the Summer Maiden, there are several implications. Firstly, from a power - standpoint, she would have access to a whole new set of abilities. This could range from elemental powers related to summer, like heat or growth manipulation, to enhanced speed or strength. In terms of the story's plot, it could lead to new conflicts. Enemies who are seeking the power of the Maiden would target Ruby more directly. It could also lead to internal conflicts within Ruby herself. She might question if she is worthy of this new power and how it will change her role within her team. Her relationships with her friends and family could also be affected. Her friends may feel a sense of pride in her new status, but also worry about the danger it brings. Her family members, especially those with ties to the Maidens, might have different reactions, such as trying to protect her or guide her in using her new powers.
Salem herself could be a great antagonist. She might be after the Summer Maiden's powers to add to her own strength or use them to achieve some evil plan. Another option could be a new character created specifically for the fanfiction, like a rogue huntsman who has turned to the dark side and wants the Maiden's power for his own gain.
A great plot could be centered around the Summer Maiden's relationships. For example, she might have a forbidden love with a character from the other side, like a member of Salem's faction. This would create a lot of internal conflict as she has to balance her feelings with her duty as a Maiden. Or perhaps she has a deep friendship with a character who is in danger, and she has to use her powers to save them from a great threat.
I'm not sure specifically as I haven't read this particular fanfiction. But generally, in RWBY, Ruby is a key character. A fanfiction with this title might focus on Ruby's journey towards becoming a maiden, exploring her growth, new powers she might gain, and the challenges she'd face along the way.
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 great RWBY Ruby Maiden fanfiction is 'Ruby's Ascent'. It beautifully delves into Ruby's journey as a Maiden, exploring her new powers and the challenges she faces. The author does an amazing job of keeping Ruby's character true to the original while also adding unique twists to her story as a Maiden.
One possible fanfiction could be about Ruby's journey as the Fall Maiden. She might struggle with the new power and the responsibilities that come with it. For example, she could face challenges from those who want to steal the Maiden's power for their own evil purposes. Ruby would have to learn to control the power quickly while still being true to herself and her values.
I think Ruby could be the most likely. She has always been at the forefront of the team, with her leadership skills and strong will. Her silver eyes already give her an edge, and as a Maiden, she could use her speed and new powers to protect her friends even better. Also, her innocent - looking exterior but strong - hearted interior would make for an interesting contrast with the powerful Maiden powers.
One possible fanfiction could be about Ruby's journey as the Spring Maiden. She might struggle to control her new powers at first. For example, she could accidentally cause plants to grow uncontrollably during a battle, which both helps and hinders her team. As she learns to master her maiden powers, she could discover new ways to use them in combination with her scythe skills, making her an even more formidable fighter.