EVERYTHING popular is parodied...just 'cause they make fun of something doesn't mean they loathe it and think it's evil and want it to die or anything, pokemon just plain IS a really very ludicrous and nonsensical franchise and easy/fun to spoof. And as for making fun of japanese people - they make fun of *all* people, and I'm sorry but just because racial stereotypes aren't true, doesn't mean they aren't funny. :D :D :D
Anyways, Kenny actually hasn't died at all since he came back. They were tired of finding a way to kill him all the time, so they had that joke episode "Kenny Dies" where they make a big deal out of him dying permanently, then he's gone for a whole season, then magically comes back at the end and never dies anymore :p