One idea could be to have Ainz Ooal Gown from Overlord end up in the RWBY world. He could be seen as a powerful new force, and his magic and strategic mind would create a lot of interesting scenarios. Maybe he'd form an alliance with one of the academies, or be seen as a threat by Salem and her forces.
One interesting concept could be the combination of the power systems. In Overlord, there are unique magic and abilities, and in RWBY, there are the Auras and Semblances. Fanfictions might explore how characters from one universe adapt to the power mechanics of the other. For example, how would a character from Overlord use an Aura if they were suddenly in the RWBY world? Another concept could be the cultural clashes. The different races and cultures in Overlord meeting the diverse characters and kingdoms in RWBY could lead to really engaging storylines.
In a fanfiction, the two magic systems could merge in an unexpected way. Suppose a powerful spell from Overlord was cast in the RWBY world during a battle. It could interact with the Dust in the air and create a new type of energy. This new energy could then be harnessed by the RWBY characters in different ways. Some might use it to enhance their weapons, while others could use it to develop new semblances.
Ainz Ooal Gown is likely one of the most popular. His powerful and mysterious nature makes him a great character to crossover. He can bring his vast knowledge of magic and leadership from Overlord into the RWBY universe. Another popular one might be Albedo. Her loyalty and combat abilities can create interesting dynamics when interacting with RWBY characters. For example, she could form an alliance with a team in RWBY and use her skills to help them in battles.
Ruby Rose is often a popular crossover character. Her positive attitude and powerful scythe - wielding skills can bring a unique dynamic to the Overlord universe. She might befriend some of the more benevolent characters in Overlord or cause chaos with her energetic nature.
The unique aspect of Overlord RWBY fanfics is the blend of two very different universes. Overlord has its dark, power - based hierarchy and complex magic systems, while RWBY has its own diverse world with unique characters and a different kind of power called Aura. When combined, it creates a whole new set of story possibilities.
One interesting 'Overlord RWBY' fanfic is 'Overlord in Remnant'. It combines the unique elements of the Overlord world with the vibrant setting of RWBY. The story often has the Overlord characters interacting with RWBY characters in unexpected ways, which makes for an exciting read.
One interesting RWBY Overlord fanfiction could be one where the characters from RWBY are transported to the world of Overlord. They might have to adapt to the new and often darker and more dangerous rules of that world. For example, Ruby could be intrigued by the magic system in Overlord and try to learn it while also facing the threats of the various powerful entities there.
Well, a new Overlord RWBY fanfic might feature unexpected crossovers between the two universes or explore previously unexplored character relationships. It could also introduce new villains or challenges for the heroes to overcome.
One idea could be the characters from RWBY ending up in the world of Overlord. They might initially be confused and have to adapt to the new, more dangerous environment. Maybe Ruby could mistake some of the Overlord's minions for Grimm and attack, causing a stir among the various factions in the Overlord world.