Perhaps in the fanfiction, Ruby's new status as the Red Dragon Empress makes her a target. Salem could send her most powerful minions after Ruby, thinking that if she can control or eliminate her, it would tip the balance in her favor. Ruby would then have to learn to master her powers quickly while also relying on her team for support.
Ruby's character could develop in terms of her confidence. As the Red Dragon Empress, she would have to take on more leadership and make difficult decisions. This would force her to grow from the sometimes - hesitant girl we know into a more assertive leader.
Well, one idea could be that Ruby's dragon faunus side is awakened by a powerful relic. And then she has to quickly learn to control her new powers. Another is that she discovers she has a special bond with a dragon - like Grimm, which is really strange as Grimm are usually just evil entities. This bond could make her question the nature of Grimm and faunus.
One idea could be a story where Ruby and Coco team up for a special mission. Maybe they have to infiltrate an enemy base, and Ruby's speed and Crescent Rose combined with Coco's fashion - inspired weapons and strategic mind make them an unbeatable duo.
One possible fanfiction could be about Ruby's journey as a Dragon Faunus in the RWBY world. She might face unique challenges, like hiding her faunus traits at first. Maybe she discovers her dragon - like powers gradually, such as enhanced strength or the ability to breathe a small amount of fire in a moment of great stress. Her friends in Team RWBY could initially be shocked but then accept and support her new identity as she learns to embrace it herself.
One idea could be that Ruby and Jaune are partnered for a special mission outside of Beacon. Ruby's speed and combat skills combined with Jaune's strategic thinking could make them a great team. For example, they might be sent to investigate a mysterious Grimm activity in a far - off village. Ruby can quickly scout the area with her speed, while Jaune plans their approach based on the information she gathers.
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 plot idea could be that Ruby's red eyes start to have a strange glow that gives her the ability to see into the future, but only in brief glimpses. She has to learn to use this new power to stop a new threat that no one else can detect yet.
Maybe in the fanfiction, Ruby is in a tough battle against a powerful new type of Grimm. As she's on the verge of defeat, she somehow unlocks the Super Saiyan transformation. Her friends are both shocked and excited as they watch her power up. Then she uses her newfound abilities to turn the tide of the battle and defeat the Grimm. The story could then explore how she trains to master this power for future battles.
One idea could be Ruby discovers a new form of nanotech in a hidden part of Remnant. This nanotech could enhance her Crescent Rose, giving it new abilities like shape - shifting or self - repair.
Well, it could mean Ruby taking on a more powerful form. Maybe she discovers a new aspect of her power that makes her aura or her appearance more red. It could also symbolize a change in her personality, like becoming more fierce or determined, which is often associated with the color red.