Issei would be a great choice as he is from the same universe and has a strong connection with Rias already. Their relationship can be further explored in a crossover, especially if they are facing new and different challenges together.
Saber from the Fate series could also be a good match. Saber's noble and chivalrous nature could interact in an interesting way with Rias's more demonic and yet also noble side. They could find common ground in their leadership roles and their sense of justice.
Obviously, Harry Potter would be one of the main characters. He brings his own story, skills, and personality from the Harry Potter series. And Rias Gremory would also be a main character as she is from her own universe. Her leadership and unique abilities would play a major role. Hermione and Ron could also potentially be main characters as they are Harry's closest friends. In the Rias Gremory side, her peerage members like Akeno or Koneko might also be important characters in the fanfic.
The main characters are Rias Gremory, who has her own set of powers and a leadership role in her devilish world, and Harry Potter, the young wizard. Rias would play a key role in shaping Harry's new path. Additionally, we might see characters like Dumbledore from the Harry Potter universe popping up to check on Harry. And from Rias's world, her servants or allies might be involved in the story as they interact with Harry.
One idea could be that Harry Potter, while on a mysterious magical journey, stumbles upon the world where Rias Gremory exists. They initially misunderstand each other due to their different magical backgrounds. Harry is used to wands and spells, while Rias has her own demonic powers. But as they get to know each other, they start to learn from one another and combine their powers to face a common enemy that threatens both their worlds.
Well, 'The Crossover of Rias Gremory' is a fanfiction that you might like. It combines the world of Rias Gremory with other fantasy elements. In this fanfic, there are some really cool battles and strategic planning. The author does a great job of bringing out the unique abilities of Rias in the crossover scenario. It also explores some new relationships that Rias forms which add depth to the story.
One common plotline could be Rias Gremory interacting with characters from another universe in a battle scenario. For example, she might team up with characters from a different anime to fight a common enemy. This can lead to interesting character dynamics as they learn from each other's powers and strategies.
The appeal of 'rias gremory crossover fanfiction' lies in the combination of different fictional elements. It allows fans to see their favorite character, Rias Gremory, in new and unexpected situations. For example, when she is crossed over into a different story world, it creates a whole new set of possibilities for adventure and character development.
Gintoki from 'Gintama' could be paired with Shizuo. Gintoki's laid - back yet strong - willed personality next to Shizuo's short - tempered and powerful nature would result in some hilarious and action - filled interactions. And Spike Spiegel from 'Cowboy Bebop' could also be a great partner for Shizuo in a crossover. The cool and collected Spike next to the hot - headed Shizuo would make for an interesting character study and some great action sequences.
Dante from Devil May Cry would be an excellent character to pair with Doomguy. Dante is a stylish demon hunter, and when combined with Doomguy's brute force approach, it would create some really cool action scenes. Also, Samus Aran from Metroid could be a good match. Samus' exploration skills and Doomguy's combat abilities could lead to an interesting story, especially if they are in a shared alien - infested environment.
Yoshi would be an excellent character to pair with Bowuigi. Yoshi's friendly and helpful nature can contrast or complement Bowuigi's personalities. Donkey Kong is another good choice. His brute strength can be a great counterpoint to Bowuigi's more strategic thinking. And Toad could be added for his loyalty and sometimes comical nature.
A rogue could be a great character to pair with an artificer in fanfic. The rogue's stealth skills combined with the artificer's gadgets can lead to some really interesting heist - like scenarios. For example, the artificer could create a device that disables security systems while the rogue sneaks in to steal a valuable item.