The Cyclops itself is of course the most important character. You could also include its parents if you want to explore its family origin. Another important character could be a wizard or a seer who has knowledge about the Cyclops' past and future.
A human character who stumbles upon the Cyclops' lair and becomes a sort of guide or friend to the Cyclops can be important. This human could help the Cyclops understand the outside world. Additionally, an elder Cyclops who holds the secrets of their kind's origin would be a great character to include. They could pass on ancient knowledge and wisdom to the main Cyclops character.
You might consider including a rival Cyclops. This could add conflict to the story as they compete for resources or for the acceptance of the Cyclops community. Also, a nature spirit like a dryad or a nymph could be included if the origin of the Cyclops is somehow connected to the natural world, for example, if they were created by a powerful nature deity.
Other important characters could be the enemies they faced during that era. For instance, the ninjas from other villages they fought against in the wars. These enemies could help showcase the Sannin's combat abilities and strategic thinking. Also, some of their comrades from Konoha, like Kakashi's father Sakumo Hatake, could be included to add more depth to the story.
Well, Batman is a must - have. He is the character that can tie all the others together. Then there's Superman, who represents the ultimate power in the League. Green Lantern is also important as he brings the power of the Lantern Corps and his unique willpower. Aquaman is vital as he can connect the League to the underwater world and has his own set of powers. And of course, Martian Manhunter with his shape - shifting and telepathic abilities can add a whole new dimension to the story.
In cyclops fanfic, the cyclops' family members can be popular characters. If there is a story about a young cyclops, his parents might play important roles. They could be trying to protect him from a world that fears him. Additionally, a mentor figure for the cyclops, like an old wise cyclops or a non - cyclops sage, can be a popular character. They help the cyclops to understand his powers and his place in the world. And don't forget about the sidekick characters, like a small magical creature that follows the cyclops around.
Natsu Dragneel is a must - include. His dragon - slayer magic is directly related to the dragons, and his fiery personality would add a lot of action to the story. Also, Igneel, Natsu's dragon father, could play a crucial role as his backstory is deeply intertwined with the Dragon Wars.
In addition to the obvious ones like Luke, Leia, and Anakin, you should consider including Padmé Amidala. She was Anakin's wife and played a big role in his life before his turn. Yoda also has an important connection to the Skywalker family as he was one of Anakin's teachers and later trained Luke. Ben Solo (Kylo Ren) is also a key character. His internal struggle between the Light and Dark Side is a continuation of the Skywalker family's complex relationship with the Force.
One idea could be exploring the Cyclops' family before they became the solitary creatures we often see. Maybe they had a large, close - knit family in a hidden valley. Another could be about a young Cyclops who discovers a unique power that sets them on a path different from other Cyclops. For example, the ability to communicate with animals which makes them an outcast among their own kind at first.
Obviously, Slenderman is the most important character. He is the source of all the horror. Then there are likely some victims in the story, though their identities might not be fully developed. They are important as they show the impact of Slenderman's presence.
Obviously Naruto himself. He is the main character and his growth and development during this arc are crucial. Then there's Zabuza and Haku. Their story of being outcasts and their complex relationship is very interesting to explore further. Tazuna also plays an important role as he is the reason Naruto and his team are in the Land of Waves in the first place.
Alistair is really important. He's a Grey Warden and a great companion. Morrigan is also crucial. She has her own mysterious powers and motives.
One important elf character is Zevran. He's an assassin from Antiva and has a complex personality. Another is Shianni, a city elf who is involved in the events in the alienage. Then there's Merrill, a Dalish elf mage who is very much into the elven lore and has her own unique quests related to it.