Title basically says it, what goofy/nonsensical change would you give any Bleach character?
I myself would give Ichigo a German mustache, monocle, and a top hat. Only other alteration is that he says "My Word!" or "Great Scott!" when something he would normally swear at happens.
Yamamoto would be given a huge Afro, like what Nordberg from Naked Gun had in the flashback scene, he is otherwise unchanged.
Ryuken would always be doing that hand stand rapid dash thing that Isshin did, with a completely serious face and no acknowledgement by anyone that something is weird about it.
Kisuke would have the voice of Kermit the Frog, he already kind of wears green so otherwise unchanged.
Soul King is Grumpy Cat.
Curious to see what you guys come up with.