Orko, the comical magician, is often a part of fanfiction. He can bring a sense of humor to the stories, but also has his own set of abilities that can be developed in unique ways in fan - created stories. For example, he might discover a new magic spell that ends up being crucial in a battle against a great evil.
Teela is also quite popular. She's a strong female character, and in fanfiction, she can be explored further in terms of her own story arcs, her feelings for He - Man, and her development as a warrior. Man - At - Arms is another one. His role as a mentor - like figure and his knowledge of technology in Eternia can be the focus of interesting fanfictions.
He - Man is obviously one of the most popular. He's the main hero, so many fanfictions revolve around his adventures, his battles against Skeletor, and his growth as a character. Skeletor is also very popular. His evil nature and his constant scheming make for great plotlines. People like to write about his attempts to take over Castle Grayskull and his interactions with his minions.
There could be a fanfiction that delves into the concept of He - Man facing a new, more powerful enemy that challenges his very understanding of good and evil. This enemy might not be as straightforward as the ones he has faced before, making him question his own methods and values.
The symbiote - Venom often has interesting interpretations in alternate universe fanfiction. In some universes, it could be a heroic entity instead of a villain, bonding with Spider - Man in a different way. Otto Octavius, or Doctor Octopus, also gets a lot of attention. In some alternate stories, he might be redeemed and become an ally of Spider - Man, or his origin could be completely different, like being a scientist from a parallel dimension.
He - Man and Skeletor are two of the main characters. He - Man is the hero, while Skeletor is the villain.
Often, the powerful dragon lords are popular. These are the characters who have control over large dragon armies or kingdoms within the dragon universe.
Teela is often a popular character in Skeletor and He - Man fanfiction. She is a strong and independent female character. In fanfiction, she might be given more complex storylines, like having to choose between her loyalty to He - Man and her own sense of justice when faced with a morally grey situation.
Batman is quite popular. His detective skills and cool gadgets make for great plotlines in gamer fanfiction. Gamers often write about teaming up with him or trying to outsmart him in a game - like scenario.
Often, there are powerful alien antagonists. These aliens might have their own motives for opposing the man of the universe, like wanting to conquer other planets or obtain a powerful artifact that he is protecting. They bring conflict and excitement to the story.
In the 'Injustice vs Masters of the Universe Graphic Novel', from the Injustice side, you have Superman. He's a very powerful character with his own set of moral dilemmas in this universe. On the Masters of the Universe side, He - Man is a main character. He has great strength and is the defender of Eternia.
Sasuke is often very popular in Naruto AU fanfiction. His complex personality and powerful abilities make him a great character to reimagine in different universes. Naruto himself is also a common focus, as writers like to explore different versions of him.