All of the images on this post were generated from the same parametric model. One can control the overall dimensions of height and run of the stair, as well as the profile of the treads and the side supports. A key parameter is “rise” which is the height of each step. Since characters need to run up these stairs, the rise is the ultimate measure of how easy/bumpy the stair will be to climb. As you adjust the overall height of the stair, the number of steps changes to maintain the constant rise value.