I'm not sure as the title doesn't give that away. It could be two star - beings, or perhaps an alien and a human who end up in the 'Cannibal Galaxy'.
There could be an alien explorer and a native of a planet in the cannibal galaxy. The alien explorer might be on a mission to study the galaxy's resources, and the native might be trying to protect their world. They fall in love despite their different motives.
It might be about a relationship within a group or society in a 'cannibal galaxy' which could mean a galaxy where resources are scarce and entities compete or consume each other in some way, and yet love still manages to exist and develop between two beings.
The title could imply a story of a relationship within the context of a 'cannibal galaxy'. Maybe it's about two entities in a galaxy that have a relationship where one consumes or takes from the other in a metaphorical or perhaps even a literal sense in a science - fiction context.
I'm not entirely sure about all the main characters specifically, but usually there are a male and a female lead.
The main characters are Star - Lord, Gamora, Drax, Rocket and Groot. Star - Lord is the leader - ish type. Gamora is a skilled fighter. Drax is super strong. Rocket is a clever and sassy raccoon, and Groot just says 'I am Groot' but is very powerful and kind - hearted.
The main female character is Cheng Shaoshang. She is a strong - willed and intelligent young woman. And the male lead is Ling Buyi. He is often mysterious and has his own secrets. Their relationship is at the core of the story.
In some 'Cannibal Graphic Novel' concepts, there could be a group of cannibals rather than just one. They might have a hierarchy within the group, with a leader who is the most feared and powerful. This leader character would have a backstory that explains how he came to be in charge. And there could be characters within the group who are having second thoughts about their lifestyle, which could add an interesting layer of internal conflict to the story.
Since I haven't read 'leaving the galaxy fanfic', it's difficult to name the exact main characters. However, they could be a diverse group. There might be a young and curious protagonist who is eager to explore the unknown. There could also be an older, wiser character who provides guidance during the journey. And perhaps there are some characters with special abilities that are crucial for the survival and success of the mission to leave the galaxy.
The main character is a college student. But there are also his friends, classmates, and people he meets during his various adventures.
Since I don't know the details of this story, I can't say for sure who the main characters are. They could be astronauts, scientists, or alien species.