I have asked myself the question, “do the dice know” many times, and many times gotten the same answer, “yep”.
What do I mean? Your dice have a favorite character. Don’t deny it, they do. They also have a least liked character. Yes, they do. How many times have you rolled a die that was doing quite well to a point that suddenly started giving crappy results when you rolled it for a different character? I have a set of sterling silver dice that had me convinced that one guy was a werewolf because I was using the dice to give a prize giveaway at Gen Con one year. Everyone rolled, the highest roll got the prize, and then we moved on to the next guy. Everyone won something, but we rolled the dice because, well, dice. The 20-sided die we used was coming up with truly random numbers until the guy with the unibrow rolled them. He ~never~ rolled above a 3. He rolled at least thirty times because that’s how many people were at my seminar, and he was dead last. I asked him if the die actually burned his skin and folks were hanging out just to see if could roll over a three, but no dice. I gave him a different die, a plastic one, and he straight away rolled a 17. The dice know
So, it is my practice to run through my dice to see which dice like whichever character I’m playing, then I stick with them. Sometimes I even grab a handful of twenties and pick which one feels right for that particular roll and that has been wildly successful. You might identify the phenomenon as me being psychic, or that I can feel which die is happy at the moment. Whatever the actual case is, include just blind luck, the very much is a distinguishable difference in performance in how the dice behave from one moment to the next and if you listen to your dice, you too will be more successful in your rolls.