Rin Tohsaka could also be an ally. She is intelligent and has powerful magic abilities. She could help Ruby understand the more magical aspects of Unlimited Blade Works and provide support in battles, perhaps with her gem - based magic.
In such a fanfiction, Shirou Emiya could be an ally. He has experience in Unlimited Blade Works and his skills in swordsmanship could complement Ruby's scythe - fighting style. They could learn from each other and fight side by side against common enemies.
A plot could involve Ruby getting a special power-up related to Unlimited Blade Works. For example, she could gain the ability to project multiple versions of her scythe, like how some characters in Unlimited Blade Works project their weapons. This new power would change the way she fights and she would have to train to master it while also dealing with the threats in her RWBY world that are now more dangerous with this new ability.
A powerful sorcerer who wants to steal Izuku's Unlimited Blade Works power for his own evil purposes. He could be from a hidden world of magic and have minions that Izuku has to fight through.
One possible fanfiction could involve Ruby sacrificing herself to save her friends from a powerful enemy. In this scenario, she might use her silver eyes one last time to hold off a horde of Grimm while her friends escape. Her death would be a tragic yet heroic moment, leaving her friends to carry on her legacy and the fight against evil in Remnant.
One type of fanfiction could be set in an alternate universe where Ruby uses Crescent Rose in a completely different way. Maybe she uses it for non - combat purposes like using the scythe part to cut through thick foliage in a forest she's exploring. Or it could be a time - travel fanfic where she has to use Crescent Rose to defend herself against enemies from a different era.
She could die in a battle against a new and extremely powerful Grimm. Maybe a Grimm that has the ability to nullify her silver eyes power and overpowers her in combat.
One possible plot could be that Ruby discovers a lemon - scented oil that has a strange effect on Crescent Rose. When she applies it to her weapon, Crescent Rose starts to emit a lemon - colored glow. This new feature attracts a special type of Grimm that is only drawn to this lemon - like energy. Ruby has to figure out how to use this new situation to defeat these Grimm and also understand the origin of the oil.
Her friends from her own time could potentially be her allies even when she goes back in time. For example, if she has a special bond with Weiss, Weiss might be able to sense Ruby's presence in the past in some way and offer help. Another possible ally could be a character from the past who she befriends, like an old wizard who recognizes Ruby's special powers and decides to help her on her mission.
One great RWBY Ruby Black Rose fanfiction is 'The Rose's Ascent'. It delves deep into Ruby's character development as she discovers new powers related to the Black Rose. The story has a great plot that keeps you on the edge of your seat with exciting battles and interesting interactions between Ruby and the other characters.
One common theme is friendship. Ruby is often shown relying on her friends and the power of their bonds in different situations. For example, in many fanfictions, when facing a powerful enemy, it's the combined strength of her friendships that helps her through.
Many Ruby Rose fanfictions touch on the theme of power and its proper use. Ruby has a powerful weapon and special abilities, and fanfictions often explore how she learns to control and use them responsibly. Another common theme is redemption. Sometimes Ruby might encounter characters who need to be redeemed, or she herself might face situations where she has to find redemption for her actions or the actions of others she cares about.