Obviously, the Goblin Slayer himself is a must - he is the central figure. The Priestess is also great to include as she often accompanies the Goblin Slayer and provides support with her healing and purification magic. Her naivete and growth throughout the story can add depth to the fanfic.
In a crossover with 'Fullmetal Alchemist', Edward Elric could be an interesting addition. His knowledge of alchemy and his quest for the Philosopher's Stone could intersect with the Goblin Slayer's world in unexpected ways. From Goblin Slayer, Dwarf Shaman could be included. His knowledge of runes and magic could complement Edward's alchemical skills, and their interactions would be full of banter and learning.
In a crossover with 'Attack on Titan', Eren Yeager could be an interesting addition. His determination and ability to transform into a Titan could be used in tandem with the Goblin Slayer's tactics. They could face off against goblins that have somehow made their way into the walls, or maybe even goblins that have been experimented on by the same people who created the Titans.
Goblin Slayer is of course a very important character. He is the main protagonist focused on slaying goblins. Priestess is another important one. She often accompanies Goblin Slayer on his missions and uses her healing and support magic. High Elf Archer is also significant. She provides ranged combat support in battles against goblins. Dwarf Shaman helps with his knowledge of magic related to earth and such elements which are useful in combat situations against goblins.
High Elf Archer is another important character. She is a skilled archer with a somewhat haughty personality. She joins the Goblin Slayer on his quests, and her interactions with the other characters, especially her banter with the Goblin Slayer, are quite interesting.
The main character is obviously the Goblin Slayer. He's the one leading the fight against the goblins.
The main character is the Goblin Slayer himself. He's the one focused on killing goblins.
In the 'Goblin Slayer Online Novel', the lead character is the Goblin Slayer. He is a complex figure driven by his hatred for goblins. Priestess is a significant character. She starts as a novice but grows throughout the story. High Elf Archer is a skilled fighter who provides ranged support. Dwarf Shaman is another key character. His knowledge of magic and the world helps the group in their battles and their travels. These characters interact with each other, and their relationships evolve as they face various challenges together in the story.
In the 'Goblin Slayer Graphic Novel', the main character is the Goblin Slayer. He is a complex figure with a tragic past that drives his goblin - slaying obsession. Priestess is an important character too. She provides support to the Goblin Slayer with her healing abilities. Also, there is Dwarf Shaman. He is an old acquaintance of the Goblin Slayer and often aids him in his battles against the goblins. Each character has their own role and personality, and together they form an interesting group dynamic in the story.
One idea could be a crossover with 'Sword Art Online'. The Goblin Slayer could be transported into the virtual world of SAO where he has to deal with goblin - like mobs in a different gaming environment. He might use his unique skills and no - nonsense attitude to clear floors and quests in the game.
The two main characters are, of course, the Goblin Slayer and the Priestess. The Goblin Slayer is a stoic and determined character, focused solely on eradicating goblins. The Priestess is a young and devout girl who teams up with the Goblin Slayer and provides support with her magic.