Undertale, UT magic and how it works
@kara_dreamer@witches.town at least, that's my take on it at any rate. The monsters that will talk to you first and foremost are all either more introverted, maybe a bit more worldly, or more reserved and saving their exuberant passionate displays of emotion for more intimate encounters... or in the case of Shyren, actually a sort of defense mechanism, and in Napstablook's case, just an unfortunate side effect of their emotional state.