A possible storyline is that the kid has a special ability that no one in RWBY has seen before. This causes Ruby to seek out old allies and make new ones in order to understand and help the child control their power. Along the way, they encounter various challenges and adventures, all while Ruby is trying to give her child a normal upbringing as much as possible in the chaotic world of Remnant.
One possible storyline could be Ruby struggling to balance her duties as a huntress and being a mother. She might have to face new enemies that target her child, adding an extra layer of danger and responsibility. Another could be the child inheriting Ruby's powers and Ruby having to train the child while also dealing with the child's own unique personality and desires.
One possible storyline could be Ruby going into a deep depression. Losing her friends would shatter her world. She might isolate herself, blaming herself for not being able to protect them. Another could be her seeking revenge on whoever or whatever caused their deaths. This could lead her on a dark and dangerous path, perhaps even sacrificing her own values in the process.
If Ruby is the older sister in RWBY fanfiction, there could be a storyline where she has to deal with the family secrets that were passed down to her as the eldest. Maybe she discovers something about their family's past that she has to protect her siblings from. Another possibility is that she has to balance her duties as a sister with her role as a huntress - in - training. She might have to sacrifice some of her own training time to look after her siblings, which could lead to internal conflicts and character growth.
One possible storyline could be Naruto using his ninja skills to protect Ruby from the Grimm. His ability to move stealthily and use jutsus could give Ruby an edge in combat.
One possible storyline could be Taiyang teaching Ruby some advanced combat techniques that were passed down in their family. Ruby, being eager to learn, would soak up all the knowledge and then put her own unique spin on it. This could lead to her developing new moves in battle.
There are also fanfictions where futa Ruby is involved in a love triangle or a complex relationship situation. This could be with a character from another school in the RWBY universe or even with an original character created by the fanfiction author. These storylines often explore themes of love, loyalty, and self - discovery within the context of the RWBY world, with Ruby's futa aspect adding an extra layer of intrigue.
A frequent theme is Ruby's nightmares. These nightmares can be intense and often wake her up in a cold sweat. The fanfictions may show how she then has trouble getting back to sleep, fearing the nightmares will return. Also, there's the theme of her self - blame. Ruby might think that she could have prevented the traumatic events, which adds to her mental anguish.
One possible plotline could be that Ruby sacrifices herself to save her friends from an overwhelming enemy. In the heat of battle, she realizes that only by giving up her own life can she ensure the safety of her team. Another could be that she is poisoned by a new and deadly Grimm toxin that slowly weakens her until she passes away, leaving her friends to avenge her.
One possible plotline could be that Ruby's death shatters her team. Weiss might become overly consumed with vengeance, leading her to make hasty and dangerous decisions. Blake could retreat into herself, feeling like she failed to protect Ruby. Yang might struggle with survivor's guilt and question her own strength. Another plotline could involve Ruby's sacrifice being the key to saving Remnant. Her death could inspire the remaining characters to come together in a way they never had before, uniting the kingdoms against a common enemy like Salem.
Perhaps in the fanfiction, Weiss dies in a tragic accident. For example, a malfunction in her weapon during a critical moment causes an explosion that she can't avoid. Her death then becomes a catalyst for the rest of the team. Ruby might become more determined to fight against the forces of evil in Weiss's memory. Blake could struggle with guilt, thinking she should have been able to prevent it. Yang might become more reckless in her anger at losing Weiss.
In some 'rwby ruby kills' fanfiction, it could be a situation where Ruby is forced to kill in self - defense against a powerful Grimm that has infiltrated a populated area. Maybe she has no other choice but to use her scythe, Crescent Rose, to take it down.