Good Cop, Bad Cop
Angua was vaguely aware that with someone like Carrot around, you also needed the people like Vimes and, if she was being honest, her as well, to be around too.
His inherent charisma and good natured optimism towards the world in general had to be anchored down by a world weary cynic, lest it float off dragging the rest of the world with it, whether it liked it or not.
It was like the old 'Good cop, bad cop' thing; a matter of balance.
But the trouble with Carrot was that she was never entirely certainwhich one he was.