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.
A fanfiction could also explore a what - if scenario. What if Ruby and Coco were switched in terms of their skills? Ruby having Coco's sense of style and Coco having Ruby's innocent charm. It would be interesting to see how they adapt to these changes while still facing the usual threats in the RWBY world.
One idea could be that Ruby and Coco team up for a special mission in a dangerous, uncharted part of Remnant. They face new Grimm and have to rely on each other's unique skills to survive. Coco's fashion - sense - related weaponry could combine with Ruby's speed and scythe skills in interesting combat sequences.
Adventure is also a popular theme. Writers often send them on quests or missions together. For example, they might be exploring an unknown part of their world, facing dangerous Grimm. This allows for exciting action scenes and the opportunity for the two characters to bond further during the adventure.
One great Ruby and Coco fanfiction is 'The Unlikely Duo'. It has an interesting plot where Ruby and Coco team up for a mission that was initially thought to be a simple one but turns out to be full of twists and turns. The author does a great job of portraying their different personalities and how they complement each other during the adventure.
Well, a great moment could be when they first meet in a fanfiction. The initial exchange of words, the sizing up of each other's abilities. It sets the tone for their relationship. For example, if Ruby is in awe of Coco's cool and collected demeanor, and Coco is intrigued by Ruby's raw talent.
In fanfiction, they could also develop their relationship through a friendly rivalry. They could compete in things like combat training or fashion design (since Coco is into fashion). This kind of rivalry would be healthy and would push them both to improve. And at the end of the day, they would still be friends who support each other. For instance, if Ruby loses in a combat training match, Coco would give her tips to improve, and vice versa.
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.
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.
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.