Originally Posted by FallenSpiral

I would have to say because... The author wanted the Japanese to not know what the characters are saying for once. We the english only speaking Americans don't know sometimes what these overseas shows are saying sometimes. The Japanese know english though. Not many Japanese speak Spanish... or at least I wouldn't think that they would. So it throws them off. They're like OMG it sounds like Japanese but was it???

Originally Posted by solking

I have to agree it is pretty easy to pronounce. Spanish is just a great language. Maybe the writer took a trip to a Spanish speaking country before he came up with Bleach and enjoyed the influence.