Hello! I am a young game developer and has an experience making one as a requirement for my school.
My idea is that the game will have the main character defeat 8 people, them being each representative of the seven deadly sins (sloth, gluttony, etc) + 1 final boss that leads them all. The representative of each character just subtly shows each sin as their skill or power but it doesn't exactly say or reveal it. (The following can be changed but this was my idea for now). For example, Greed has a skill to steal the character's ammo and take all their things. Sloth can manipulate time and make it slow. Wrath is a fallen soldier who refuses to stay down.
My problem is that I have trouble making a good storyline where the main character has a motive as to why they need to defeat each boss. I also thought of a plot twist where the main character is the 8th sin but left the group because he felt something that that wasn't right.
I would like it so that the characters are in one single big area but different sides.