probably you already know this method but
i dont' know if is the right method but in my muger work,if you open the char, in the costant there is this:
[Size]
xscale = 1 ;Horizontal scaling factor.
yscale = 1 ;Vertical scaling factor.
ground.back = 15 ;Player width (back, ground)
ground.front = 16 ;Player width (front, ground)
air.back = 15 ;Player width (back, air)
air.front = 15 ;Player width (front, air)
height = 60 ;Height of player (for opponent to jump over)
attack.dist = 160 ;Default attack distance
proj.attack.dist = 90 ;Default attack distance for projectiles
proj.doscale = 0 ;Set to 1 to scale projectiles too
head.pos = -7, -96 ;Approximate position of head
mid.pos = -0, -66 ;Approximate position of midsection
shadowoffset = -1 ;Number of pixels to vertically offset the shadow
draw.offset = 0,0 ;Player drawing offset in pixels (x, y)
you see
[Size]
xscale = 1 ;Horizontal scaling factor.
yscale = 1 ;Vertical scaling factor.
if you change the value example in 1.10 the size increase if you write 0.90 decrease