Who could be the main antagonist in a Blind Steven Universe fanfic?

A group of Homeworld Gems who believe that Black Pearl has become too 'contaminated' by her interactions with the Crystal Gems and Steven. They see her as a threat to the traditional Gem order and send a special task force to capture or destroy her, which would make them the main antagonists as they try to stop Black Pearl from living her new life.

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.

It could be a corrupted Gem from the past that was somehow locked away and now resurfaces in the future, angry at the changes that have occurred. This Gem might not understand the new world order and wants to return things to how they were.

A powerful, ancient sorcerer could be a great main antagonist. This sorcerer could have been locked away for centuries but has now broken free and wants to take over the universe from the Master of the Universe. He could have dark magic that the Master has never faced before.

Another possibility is a new character that is unique to the other universe. This character could be jealous of Harry's arrival and the power he might bring from his own universe. So, this character tries to stop Harry from exploring and potentially changing the new universe.

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 a story where Steven, despite being blind, discovers a new power within himself that is related to his sense of touch. For example, he can sense the emotions of the Gems through their gemstones when he touches them. This would add a new dimension to his relationships with the other characters.

Pearl, who was once Pink Diamond's servant, is another main character in many of these fanfics. Her loyalty to Pink Diamond, and how that loyalty has changed over time and affected her own character development, is a major aspect in these stories.

The main characters are likely Steven and Lemons Fresh. Steven is a well - known character from the 'Steven Universe' series, being half - human and half - gem. Lemons Fresh is also an important character in this fanfic, though might be a less known or original creation specific to the fanfic.

Well, it's likely that Steven would still be one of the main characters. He often plays a central role in any Steven Universe - related story. Alongside him, there could be new characters created specifically for this fanfic that are somehow connected to the Black Diamond. And of course, any of the existing main Gems from the show like Garnet, Amethyst, and Pearl might also be important characters in this fanfic, especially if they interact with the Black Diamond in some way.