The thing about Ifan is that I feel like he was originally intended to be the canonical main character. He doesn't seem to really have an involved personal main quest like many of the other characters do, but that's because he has links to the main antagonists (meaning merely progressing through the game's critical path -IS- his personal arc), while everyone else save for Fane are mainly linked to side plots/antagonists instead. You can see this with how he's generally presented front and center in promotional material for the game too, even though he's canonically an archer.
Fane was a Kickstarter companion created by a guest writer, and from the community's point of view, he has a strong claim for canonical main character position since he basically represents the entire background plot of the game.
I've been getting the same vibe so far, that Ifan is maybe the true MC
Tbh, we need to keep in mind that the game was DESIGNED with the Origin System in mind, with it probably being used as a base assumption for most playthroughs. I think Ifan is the male MC Origin, Sebille is the female MC Origin (except for one small problem late), Fane is an MC Origin because of other reasons, and the other three are Origins with their own unique takes on the world and its lore, but not necessarily bound to the main plot.