When rikimaru is wearing the ninja armor, ranged attacks won't damage him(especially in the cemetery). As for ayame, I don't know.Sorry

When stealth killing, if you don't want to watch the kill, press O as during a stealth kill and it will skip it.

It is possible to kill every Sentry in Wrath with the same riceball. Throw the riceball at your intended victim, then wait until he goes to grab it.

After he picks it up,but before he starts to eat it, run in for an instant stealth kil. The guard will be totally defeseless while he's holding the riceball, and once you attack him , he'll drop it.

Pick the riceball up and move on to the next guard

in multiplayer mode u get to play as alot of caharcters heres sum moves for each character except tatsuramu as all of his moves are just square square lot of squares lol
here we go:
jinnai: circle (when close)
r2,up+,X,square
x,square r2,down+square
circle+X
Mr.D ceo
circle when close
r2,up +x,square
circle+X
360 turn and press square
Tajima: circle, when close r2, up +X,square
circle+x (cool move fly baby!)
360 square, square, square ,square ,square, square.
Kagura:
circle+X (evil laugh also increases her strength
r2,down+square
360, square
r2+x (this is a teleport so hole r2=x and a direction u wish to go
r2+square and left (hold them altgether)
Nasu: circle + X, square or R1 + square square
Chibot:
circle + X
R2 down + square
Kenpo: down + square
O +X
Square square R2 + down square square

When you walk around in water it makes noises, alerting every enemy in the area.Instaed,jump into the water.while your in the air, hold down R1(the crouch button).When you land(Keep R1 held down) the water won't make a sound.Walk around in the water while your still crouched and the water still won't make a noise.