Ichigo and Steven would be obvious choices. Ichigo is the main protagonist in Bleach, strong - willed and with great power. Steven, on the other hand, is kind - hearted and has a unique way of looking at the world. Their different personalities could lead to some interesting interactions. They could start off as strangers in a new combined universe and gradually become friends as they face common enemies or challenges.
Uryu Ishida from Bleach could be a main character as well. His Quincy abilities are unique, and his personality is somewhat reserved. In a crossover with Steven Universe, he could be the one to study the Gems' technology or powers from a scientific perspective. He might team up with Pearl, who also has an in - depth knowledge of Gem lore and technology. Their combined knowledge could help them solve various problems that arise in the crossover universe.
Garnet from Steven Universe could also be a main character in such a fanfiction. She is a fusion of Ruby and Sapphire, representing love and stability. If she were to interact with the characters from Bleach, she could offer her wisdom and strength. Maybe she would meet Byakuya, and they would have a very different kind of relationship. Garnet's ability to see into the future could be a great asset in the more dangerous Bleach universe.
It could be an evil ninja who has somehow gained access to Gem technology. He uses the power of the Gems to enhance his own jutsu and becomes extremely powerful. His goal could be to take over both the Naruto world and the world of the Gems.
Madoka could be one of the main characters. She could interact with Steven, learning about his powers and his way of protecting the world. It would be interesting to see how her more somber and self - sacrificing nature would mesh with Steven's more upbeat and positive personality.
One idea could be that Ichigo from Bleach ends up in the Steven Universe world. He might be confused by the Gems' powers at first. Then he could learn from them and they from him. For example, he could teach the Crystal Gems about his Hollow powers, and in return, they could show him how to use Gem magic in a new way.
If it was a crossover with "She - Ra and the Princesses of Power", Adora could be a main character. Her strong leadership and the power of She - Ra would be an interesting contrast to Steven's more laid - back leadership style. Together, they could fight against a common enemy that threatens both their worlds.
Another option is an ancient evil that was once sealed away by the Diamonds long ago. But due to some recent events in the Steven Universe universe, it is starting to break free. This evil force could target Blue Diamond because of her past actions and Steven because of his potential to stop it.
The main characters would be the son of Yellow Diamond, of course. Then, the Crystal Gems like Garnet, Amethyst, and Pearl would be important. They could be the ones who initially view the son with suspicion but later come to accept him. Another possible main character could be Peridot. She has knowledge of the Diamond hierarchy and could help the son understand his place in it, while also learning from him about a different perspective on the Diamonds.
Ichigo from Bleach could be a main character. His strong sense of justice and powerful combat abilities would make him a great fit for the nightmarish world of Little Nightmares. He could be on a quest to save the innocent souls trapped there.
Obviously, Pearl is one of the main characters. She's the refined, sword - wielding Gem we know from the show. In the context of Pearl Lemon fanfiction, Lemon becomes a central figure as well. This new character could be anything from a mysterious new Gem to a human with some special connection to the world of Gems. Their interactions and the relationship between them form the core of the fanfiction stories.
Well, consider the idea of some new characters being introduced as part of the harem too. Maybe a Gem from a far - off colony who has heard of Steven's exploits and travels to meet him. Or a human girl who lives near the beach where Steven often is and becomes smitten with him. The harem could also include a fusion of two Gems that has a unique personality of its own and is attracted to Steven's inclusive and accepting nature. There are so many possibilities when thinking about who could be part of the harem in this fanfiction.
The main characters are obviously Steven and May.