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I think you misunderstood the intent of my comment, so I'll try to help you out.

The concept of making your MC relatable to your audience is a fundamental and basic principle of storytelling. Depending on the genre and style of your game or story the techniques that you use to accomplish this may vary. 

You mentioned that by my standards the MC shouldn't have any dialogue at all. This made me chuckle because that wasn't really what I was saying, however, that very concept is actually a thing. It's called 'The Silent Protagonist'. Here's a portion of a Wikipedia page that explains the concept. 

"In video games, a silent protagonist is a player character who lacks any dialogue for the entire duration of a game, with the possible exception of occasional interjections or short phrases. In some games, especially visual novels, this may extend to protagonists who have dialogue, but no voice acting like all other non-player characters. A silent protagonist may be employed to lend a sense of mystery or uncertainty of identity to the gameplay, or to help the player identify better with them."

You may take note of the last sentence in the paragraph which explains this as a technique of making the MC more relatable to the player. Off of the top of my head, Link, from the Legend of Zelda series is one of the most iconic examples I can think of.

Now that's all well and good, but you might say a completely silent protagonist doesn't really fit into this genre of game. And you would be right. It would be impossible to have this MC be completely silent. However, there are still techniques that you can use to make the MC more relatable to a wider base of players. 

A great example of how this can be done in this particular genre of game is 'Karlsson's Gambit'. I would highly recommend playing that game. The way the creator achieves a relatable MC is by tastefully integrating internal dialogue with choices. When the MC is interacting with other characters, there is often a point in the interaction where you as the player decide the internal dialogue of the character via options of dialogue or thoughts. This strategy is also used by bioware for games like 'The old Republic', or 'Mass effect.' In these games, there is close to no internal dialogue of the main character and customizable external dialogue for required interactions which may affect the direction of the story. 

By eliminating non necessary and oddly specific internal dialogue of the MC you make your character more appealing to a wider range of players.

I've bought and played a few of these graphic novel adult games, and unfortunately there seems to be a common stylistic choice of writing out the main character's internal dialogue. This is unfortunate because it breaks immersion by putting someone else's thoughts in the mind of the player rather than allowing the player to put their own thoughts into the main character.

What I mean is, by giving the main character internal dialogue, you break immersion for the player because the player doesn't always think like what you've written. An example would be in the first scene, when the main character is having a conversation with the woman at the counter, he thinks something along the lines of: 'I bet daddy pays for all of her stuff'. It didn't really align with the opinion, I, as the player was forming about the woman in the scene, or fit with my own personality. When making a game like this, you want the player to immerse themselves into the main character. By not giving the main character an internal dialogue that could conflict with the personality of the player, you allow the player to form their own thoughts and opinions on the story and characters instead of telling the player what to think.