It has to be Vimes. Not just because he sticks it to the gits in society who well and truly deserve to have it stuck to them, but mostly because (as a grumpy, cynical bastard) he reminds me a lot of my dad who introduced me to Discworld when I was 12 and then passed away when I was 13. He was buried with a copy of The Colour of Magic.
On a less melancholy note, I think special mention should be given to Nanny Ogg. If my Vimes reminded me a bit of my dad then my mum is undoubtedly the complete Roundworld equivalent of Gytha Ogg. A foul, dirty-minded old woman, desperate for a tribe of grandchildren (which, at 18 I am quite reluctant to give her just yet, thank you). I think people always overlook her in favour of Granny Weatherwax, I think, in her own way, she can be just as powerful.
Rincewind for his cowardly acts, Cohen because the idea of a barbarian in his late 80's is complete madness but such fun to read, and The Librarian (well why not). I've never known me laughing so much at the word 'Ook.' If in fact it is a word?
No. I don't imagine anyone west of Bree would have much interest in "adventures."
Nasty.... Disturbing... Uncomfortable things......................Make you late for dinner.