No, crying the name of an attack is not neccessary. Ranma does not 

always cry out attack names when he uses them (Example - watch the 
second Ranma movie.) Cologne and Happosai only uses attack cries when 
their gloating.

The pourpose of screaming out the name of the attack, from what I can 

tell, is as a concentration trick. These special attacks require the 
user to martial energies - either internal or external - to perform. 
Useing an attack cry seems to be a method for focusing that energy 
faster.

Or, of course, I could be completly wrong, and they just do it to sound 

cool... ^^;;;

  Okay, people, when thinking of calling out attack names, think about 
real life martial artists and the tendancy to yell out "hiya!" or 
what-not; it's done for the same reason which was pointed out above (I 
think). 
  I don't hope to end this thread, but still, it's getting a little onto 
me. 

"Ha-ha-ha-ha-ha! Fool! Pain is my friend. Allow me to introduce YOU to 
it!" --Inferno, Beast Wars
"Decepticons FOREVER!!" --Ravage, former Decepticon
"Your persistence is futile! I rise again!" --Rampage
"[Rampage] may be ugly, but he's a PREDACON!" --Quickstrike

--Razorclaw X

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