It's likely Klaus Mikaelson. He's an Original vampire - werewolf hybrid in The Originals. He has super strength, speed, and his werewolf side gives him an edge in combat. In comparison, the vampires in Twilight, while strong, don't have the added advantage of being part werewolf. Also, Klaus has a lot of experience and is very cunning, which would make him a formidable force in a crossover situation.
If we look at the character of Nico di Angelo from Percy Jackson, his ability to control the dead could be a game - changer when dealing with the vampires in The Originals. Vampires are technically undead, so Nico might be able to manipulate them to some extent. However, the witches in The Originals have their own magic to resist such things. And on the other side, characters like Elijah Mikaelson are very skilled fighters and diplomats. Their charm and combat skills could make them a formidable opponent against the Percy Jackson characters. In the end, it's all about the creativity of the fanfiction writer in determining who is the most powerful in these crossovers.
Klaus Mikaelson might also be considered the most powerful. His hybrid status gives him super strength, speed, and the ability to compel others. In the world of Game of Thrones, he could easily use his compulsion on many of the characters to get what he wants. He's also very difficult to kill, which would give him an edge over most characters from Game of Thrones.
Elijah is another popular character. His sense of loyalty and honor, despite being a vampire, makes him stand out. In fanfiction, his relationships with his family members can be explored in more depth, such as his unwavering support for Klaus even when Klaus makes it difficult, and how he tries to keep the family together.
Definitely Naruto. He's the main character of the original series, and in 'naruto and the originals fanfiction', fans often like to put him in new and exciting situations. Kakashi is also a favorite. His mysterious past and cool abilities make him a great character to write about. And Hinata, because of her relationship with Naruto and her own growth as a character.
Klaus from The Originals is often very popular. His complex personality, being both a villain and a character with a tragic past, makes him a great addition to fanfiction. He can bring a sense of danger and unpredictability to stories that involve the Twilight characters.
Klaus is often very popular in 'the originals fan fiction'. His complex personality and troubled past make him a great character to explore further. Elijah is also popular as he is the more level - headed and noble brother. And Rebekah, with her strong will and desire for a normal life, is frequently a fan favorite in the fan fiction world as well.
The crossovers where Naruto's chakra is compared to the magic in 'The Originals' are really interesting. It's like finding a parallel between two different power systems.
Percy Jackson himself is often a very popular crossover character. His unique powers and his heroic nature make him stand out. He can bring a different kind of energy to the world of The Originals. Another popular one could be Annabeth Chase. Her intelligence and strategic thinking can be a great asset in the complex world of The Originals where there are always power plays and battles to be won.
Luna Lovegood is also a favorite. Her unique view of the world can add an element of surprise in fanfiction. In a story with 'The Originals', she might befriend some of the witches in the Mikaelson family, sharing her strange but profound knowledge of magic.