>>16
Yet it could be that the conversation was written from a japanese POV, or for a japanese audience, so that if honorifics were stripped due to in-story cultural context it'd leave the conversation's depth truncated. In that case, IMO, it'd be appropriate for two crackers to call each other "Dude-kun" and "Man-san" even if such conventions were never be followed outside a thoroughly weeaboo context in the real world.

I'm just speculating here, however, since I've never seen a manga featuring non-slanties having a discussion in a supposedly foreign language.