As far as glow animation goes:
That single sprite is going to be turned into an animation. Obviously you'd want to place it in Fighter Factory, crop it, then code it to the necessary deltas/start pos before you begin coding the animation. Considering the stage is HR the deltas would most likely be 2,2 for the floor, so this sprite would be so also. Unless you're coding for Mugen 1.0 in which case your foreground deltas would be 1,1 and likewise with the glow sprite.
Let's analyze some code necessary to make this glow happen:
type = anim
actionno = 1
start = 0,0 <-----------Adjust to the correct start pos.
delta = 2,2 <-----------Adjust to the correct deltas.
mask = 1
trans = addalpha
alpha = 80,150 <------------ This will determine the brightness/full color amount of the sprite. increasing it will make the full color come in more, decreasing it like it is in the example will make it darker (draw less color out of all 256 colors.)
[Begin Action 1]
This would come after the snippet of code above. Let's analyze it a bit: 1,0
- The numbers highlighted in red are your sprite/group numbers from Fighter Factory.
- The number highlighted in blue is the ticks (speed of the animation) increasing it, will increase the tick amount therefor making the animation take longer to complete, lower being faster.
- That last part in green will vary in your lines of animation. This, like the alpha above, draws out how much of the colors will appear in that line of code in that instant of MUGEN. Knowing that, if you look how they gradually decrease in the first part, you should see a pattern, but the second number always remains 256 in it (remember 256 is the amount of colors in the sprite) the pattern of decrease for a light glowing would typically decrease the color amount, then increase after it's decreased to it's full amount. Example:
....... (all numbers in correct order decreasing by 10-or however much you see fit.)
90 (again however much you see fit)
Then begin increasing again after a certain point. This will simulate a light glow effect in MUGEN. For reference look at my rooftop stage, or Dissidia's Luminance City stage. Both available here: http://network.mugenguild.com/glb/
As for the stage you posted, don't sweat it. I'm 99% sure that one was unanimated and single layered. So you're good.