7.2 MSQ opinions (spoiler obviously)

[Exmo]

It's about the warrior of darkness, duh.

Seriously though, the player character has always been the main character, hence y'know, you playing them. You're watching/experiencing the journey of the WoL 99% of the time. The primary narrative of every story in the game is filtered through your character, not someone else. The fact that other people have more backstory for why they do something is inconsequential. It'd be like suggesting that Martin is the main character of Oblivion because he's the most prominent NPC despite the entire rest of the massive game.

You're describing a point of view character. That's not the same thing as a protagonist or main character (in terms of story focus).