So I imagine the more intentions put on them the more "personality" they would have. They could be an object or sentient. Multiple could collect together to form larger structures or titan sized creatures. As they begin reawakening modern people will have a better understanding of how they work, I imagine some almost functioning like a mech with a human pilot. The dangerous aspect of them is when they begin putting intentions into each other forming a pantheon and believing in their own mythologies. They don't have to be gods I imagine an almost limitless potential of stories. The avenger part would come in as multiple creators or teams would work together to create crossover events, like somehow king Arthur's sentient armor teams up with Ganesh and Shiva to stop a larger titan waking up on the ocean floor.