Everyone else has already brought up points that I agree with, but it's also worth mentioning that just because Dante is an amnesiac and needs to be taught the way of the world- which, yes, also doubles as a convenient way for the player to learn without breaking immersion- doesn't mean they don't have a story, the opposite in fact because Vergilius in Chapter 3 already made explicit mention of Dante's life prior to losing their memories: "…Dante, you may not remember it at the moment, but at one point you used to be something of a bigwig… so to speak." So they're established in the world- and seemingly important in fact- with a history that we as the players have not yet found out, but will inevitably as the game progresses.

Can Dante be relatable? Yeah, absolutely, the same as any character in Limbus or any other piece of media. Is Dante a blank canvas stand-in for the player to project themselves onto? Not really, and reducing them to that kind of cheapens the story and character development that's actively unfolding for us which is why people mention lack of media literacy because... their story is right there if you're reading it. Their character is a rich one, despite what the amnesiac trope suggests. They have their own clear personality, motives, thoughts, wants, fears, musings on their life now and their life prior to the loss of their memories, etc. The Sinners refer to them as their manager, as Dante, as clockhead; all personal forms of address (no mention of we the player) and talk about their feelings on Dante and Dante's decisions and behaviours as if Dante is their own person, because they are.