You keep saying he's hard to approach, when I assure you that's not the case. Because I don't write characters that don't talk with people, regardless of how stoic they are. That'd just be silly.
I mentioned Guts because he's the same way. Stoic, and rather gritty, but he still talks to people, because Miura knows how to write. You're trying to pin what's typically an author's error on a character. I am assuring you there's no problem, because I am telling you I know how to type up talking. Just because someone isn't bubbly and outgoing doesn't mean they don't know how to talk.