My favourite has to be Lilarcor [http://forgottenrealms.wikia.com/wiki/Lilarcor] from Baldur's Gate 2.
Why you ask? Because it's a talking sword that says things like this;
'I don't know what you were expecting, but as a sword I'm pretty one-dimensional in what I want.'
'You know, my last owner always said I was sharp and edgy. He was such an ass.'
'...and this one's for grandma, who said I'd never amount to anything more than a butterknife!!'
Why you ask? Because it's a talking sword that says things like this;
'I don't know what you were expecting, but as a sword I'm pretty one-dimensional in what I want.'
'You know, my last owner always said I was sharp and edgy. He was such an ass.'
'...and this one's for grandma, who said I'd never amount to anything more than a butterknife!!'