Go to the character's CNS file and open it in notepad.
Characters may have multiple cns files, but you're looking for the one that has something like this:
[Data]
life = 1000
power=3000
attack = 100
defence = 100
fall.defence_up = 80
liedown.time = 50
airjuggle = 15
sparkno =s7000+random%8
guard.sparkno =s7105
KO.echo = 0
volume = 255
IntPersistIndex = 50
FloatPersistIndex = 40
[Size]
xscale = 0.85 ;Horizontal scaling factor.
yscale = 1 ;Vertical scaling factor.
ground.back = 15 ;Player width (back, ground)
ground.front = 16 ;Player width (front, ground)
air.back = 12 ;Player width (back, air)
air.front = 12 ;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 = -5, -95 ;Approximate position of head
mid.pos = -5, -60 ;Approximate position of midsection
shadowoffset = 0 ;Number of pixels to vertically offset the shadow
draw.offset = 0,0 ;Player drawing offset in pixels (x, y)
[Velocity]
walk.fwd = 2.5 ;Walk forward
walk.back = -2 ;Walk backward
run.fwd = 6,0 ;Run forward (x, y)
run.back = -4.5,-3.8 ;Hop backward (x, y)
jump.neu = 0,-10 ;Neutral jumping velocity (x, y)
jump.back = -3 ;Jump back Speed (x, y)
jump.fwd = 3 ;Jump forward Speed (x, y)
runjump.back = -2.55,-9.1 ;Running jump speeds (opt)
runjump.fwd = 4,-9.1
airjump.neu = 0,-9.5
airjump.back = -2.55 ;Air jump speeds (opt)
airjump.fwd = 2.5
[Movement]
airjump.num = 1 ;Number of air jumps allowed (opt)
airjump.height = 25 ;Minimum distance from ground before you can air jump (opt)
yaccel = .45 ;Vertical acceleration ;.44 big then fast
stand.friction = .85 ;Friction coefficient when standing
crouch.friction = .82 ;Friction coefficient when crouching
Add the following (if it's not already there) under the "movement" section:
[Quotes]
victory1 = *insert win quote here*
victory2 = *insert win quote here*
victory3 = *insert win quote here*
etc...
it can go up till victory 99.
Example:
[Quotes]
victory1 = "I win, looser."
victory2 = "You really suck."
victory3 = "I told you to stay out of my way."
victory4 = "Is that really all that you have?"
victory5 = "That was really easy."
victory6 = "Next time fight for real"
victory7 = "I'm Sorry about that beating that I gave you. Next time I will go easier on you."