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Description
For this tutorial, I will be using the same motion on all the Mikus. If you're going to test a variable scientifically, you need to keep all other elements the same so that you can be sure the differences are strictly due to what you're testing. I created a simple motion of jumping jacks specifically for this physics study. And this is indeed going to be a study. MMD physics school is now in session.

About This Setting
Mass is a measure of how much matter is in an object. Small values are going to equal small mass, aka lightweight things such as earrings or a very delicate fabric such as silk. Bigger values are warranted for heavier stuff such as your model's torso or a sword. If anyone is familiar with "Force equals mass times acceleration," this setting helps control which one is going to hit harder when two dynamic physics collide.
Unfortunately, there is no way to tell what units these numbers represent. Is it kilograms? Grams? Pounds? I would personally be inclined to think it is "kilograms," since that is the international standard used by science, along with the unit used by most of the world (Including Japan, which is where MMD comes from.), and also because kilograms actually measure mass.
Pounds, unless specifically clarified to be pound-mass, can be used interchangably to refer to mass OR weight. Weight is not mass. Weight is a measure of how hard gravity pulls on mass. The two are thus related to each other, but they are not the same thing. For example if you could stand on the moon, you would weigh less because it has less gravity than Earth, but your body's mass would not change.

Miku vs Mass Miku
The differences on this comparison are subtle. It doesn't seem to have much difference in Miku's pigtails, but if you look to her skirt, that is where it seems to be most noticable. Mass Miku's skirt hugs her hips more closely as gravity is pulling on it more strongly than the unaltered skirt. (Had I used a different camera angle, this would likely also be the case in the front and back of the skirt, as well.) Her tie also hangs a little closer to her chest, and her bangs hug her face just a bit more in comparison to the unaltered physics. This is most strongly evidenced by how much of her left eye is covered by her bangs.

Part 1: You are here
Part 2: www.deviantart.com/amenrenet/a…
Part 3: www.deviantart.com/amenrenet/a…
Part 4: www.deviantart.com/amenrenet/a…
Part 5: www.deviantart.com/amenrenet/a…
Conclusion: www.deviantart.com/amenrenet/a…

Credits:
Miku model by Animasa, recolors by me
Sweet Shader MME
EZGIF.com used to convert video into GIF
Post-render and post-conversion editing done with paint.net and Easy GIF Animator

Description
For this tutorial, I will be using the same motion on all the Mikus. If you're going to test a variable scientifically, you need to keep all other elements the same so that you can be sure the differences are strictly due to what you're testing. I created a simple motion of jumping jacks specifically for this physics study. And this is indeed going to be a study. MMD physics school is now in session.

About This Setting
Mass is a measure of how much matter is in an object. Small values are going to equal small mass, aka lightweight things such as earrings or a very delicate fabric such as silk. Bigger values are warranted for heavier stuff such as your model's torso or a sword. If anyone is familiar with "Force equals mass times acceleration," this setting helps control which one is going to hit harder when two dynamic physics collide.
Unfortunately, there is no way to tell what units these numbers represent. Is it kilograms? Grams? Pounds? I would personally be inclined to think it is "kilograms," since that is the international standard used by science, along with the unit used by most of the world (Including Japan, which is where MMD comes from.), and also because kilograms actually measure mass.
Pounds, unless specifically clarified to be pound-mass, can be used interchangably to refer to mass OR weight. Weight is not mass. Weight is a measure of how hard gravity pulls on mass. The two are thus related to each other, but they are not the same thing. For example if you could stand on the moon, you would weigh less because it has less gravity than Earth, but your body's mass would not change.

Miku vs Mass Miku
The differences on this comparison are subtle. It doesn't seem to have much difference in Miku's pigtails, but if you look to her skirt, that is where it seems to be most noticable. Mass Miku's skirt hugs her hips more closely as gravity is pulling on it more strongly than the unaltered skirt. (Had I used a different camera angle, this would likely also be the case in the front and back of the skirt, as well.) Her tie also hangs a little closer to her chest, and her bangs hug her face just a bit more in comparison to the unaltered physics. This is most strongly evidenced by how much of her left eye is covered by her bangs.

Part 1: You are here
Part 2: www.deviantart.com/amenrenet/a…
Part 3: www.deviantart.com/amenrenet/a…
Part 4: www.deviantart.com/amenrenet/a…
Part 5: www.deviantart.com/amenrenet/a…
Conclusion: www.deviantart.com/amenrenet/a…

Credits:
Miku model by Animasa, recolors by me
Sweet Shader MME
EZGIF.com used to convert video into GIF
Post-render and post-conversion editing done with paint.net and Easy GIF Animator