>>10126913My brother and I have been designing our own version of DnD made for Lego figs. We call it "Lego Tabletop RPG"
It addresses what you said about Lego being the perfect medium for actual dungeoneering and role playing.
For example the standard pirate build in pic related would have a D6 sword and a pistol that hits for (D4 +1) but if it Crit fails, it blows up in your hand and hurts you.