Man takes or attempts to take a wife who is connected with the underwater world (fish, crab, snake, water animal and the like)
Women who possess supernatural power and usually come from a non-human world (from sky, from under the water, they are winged beings, bird- or animal-persons) take off their clothes (feather skins and the like) or part of it. Because a man hides the clothes (of one of them), their owner(s) have (has) to marry him or help him
First fire is sent to earth from the sky or the ancestors ascend to the sky and bring from there fire or warmth
The lightning (and thunder) is (produced with) an object (axe, sword, mirror, belt, stones, skin, etc.) in hands of anthropomorphic being
A man consciously marries a woman related to the non-human world