You can make any of the characters dead by removing IsCharacter=1 or changing it to 0 in the .fpe file. Attached is an example of an fpe file for any character. Just copy the fpe for Aiko for example, and change it like the one in the attachment.
Of course, once they are dead this way, you can't make them get up and they can't be posed. They're just dead. If you leave them dynamic you can throw them around though.
;header
desc = aiko (dead)
;ai
aiinit = appear1.fpi
aimain =
aidestroy =
aishoot =
soundset =
;spawn
spawnmax = 0
spawndelay = 0
spawnqty = 0
;orientation
model = aiko.x
offx = 0
offy = 0
offz = 0
rotx = 0
roty = 0
rotz = 0
scale = 80
fixnewy = 180
;cone of sight
coneheight = 53
coneangle = 50
;visualinfo
textured = aiko_1_D2.tga
effect = effectbankbumpbonebumpbone.fx
castshadow = 0
;decals
decalmax = 2
decal0 = red
decal1 = blood
;identity details
strength = 0
ischaracter = 0
hasweapon =
isobjective = 0
cantakeweapon = 0
Brian.