Ooooh just one?
Hmm mine would have to be from ep 13 of Ronin 
Warriors when Shuten Douji's helmet shatters and 
the other Ronins see his face for the first 
time.  The way his gorgeous red hair flows in the 
wind, the surprised look and the little trickle 
of blood.  *wantwantwatnlustwantwant*  Or one 
where his kanji symbol is glowing.  Sadly the 
only times I've seen cels of him for sale at all 
they were tiny little figures, I'm hoping to win 
one off Y Japan(and probabaly going to give 
myself an ulcer waiting for the outcome)