Since Harry is captaining the Aquila, he is a main character for sure. There might also be some of his friends or comrades who join him on this adventure. It could be that there are some original characters created by the fanfic author as well, who play important roles in the story, like a wise old mentor figure who gives Harry advice about captaining the Aquila, or a mischievous sidekick who gets into trouble and Harry has to bail them out.
Well, in a 'harry captains the aquila fanfic', it could be that Harry is leading a group or an adventure centered around the Aquila. Maybe Aquila is a special place, like a magical realm or a secret base, and Harry has to use his leadership skills to navigate through various challenges there. It could involve battles, making alliances, and uncovering secrets within this 'Aquila' world.
The restless souls on the ship itself could turn against Harry. Maybe they are so used to their cursed state that they don't want to be redeemed or set free, and they see Harry's attempts as a disruption to their eternal existence.
Since I haven't read the story, I can't say for sure who the main characters are. They could be scientists, given that the story involves something like an 'aquila rift' which might require scientific study.
I'm not entirely sure without more specific information about the 'Aquila Rift short story', but often in such stories, there could be an explorer or a scientist as a main character who is leading the expedition into the Aquila Rift.
In 'captains courageous novel', the main character is a young boy who is initially out of his depth but gradually finds his place at sea. The captain is another key character. He is a figure of authority and wisdom. He has a tough exterior but a kind heart deep down. There are also the various crew members. Some are tough and no - nonsense, while others are more jovial. For example, there might be a cook who provides some comic relief with his stories and antics. All these characters together create a vivid picture of life on the ship and drive the plot forward.
The main characters are likely to be those who are either in the process of becoming a captain or king - like figure or those who already are. There could be a character who is a self - made 'captain', rising through his own efforts in a particular field, say business or adventure. And then there could be an established 'king' character who rules over a certain area or group of people. Other important characters could be those who are affected by the actions and decisions of these captains and kings, such as the common folk or those in the lower rungs of the power ladder.
I don't know for sure since I haven't read it, but typically in a story like this, there might be an adventurous captain leading the expedition, a brilliant scientist, and a tough-as-nails mechanic.
As I don't know the novel well, it's hard to say. But likely the captains would be main characters, and of course, the king. There might also be other characters like advisers to the king, or members of the captains' crews.
The members of the 36 Bad People Commandant included Yuan Tiangang, Yang Shuzi, Lu Youjie, Huiming, Shangguan Yunque, Wen Tao, Shi Yao, Chi Li, Chi Li, Mirror Heart Demon, Duan Chengtian, and the Three-Thousand Nunnery. These characters played important roles in the animated series "Bad People."
One possible plot is that Harry discovers that there is a greater purpose for him captaining the Flying Dutchman. He could be on a quest to redeem the souls on the ship by facing off against powerful dark forces that are linked to the curse of the ship. Along the way, he might make unexpected alliances with other magical beings from the sea world.