The good: Xaro is extremely wealthy and powerful and vouches for Daenerys to enter Qarth when his 12 fellow leaders are prepared to refuse her and the remains of her Dothraki horde. He is by all accounts a hard worker, working his way from nothing to the wealthiest merchant in his city.
The bad: He only wants to marry Daenerys to improve his own wealth and status, essentially using her as arm candy while benefiting from her dragons as an intimidation tactic. When she refuses his proposal, Xaro backstabs Daenerys by seducing her maid and stealing her dragons. Understandably, Daenerys kills him, which is why he's last place on our list.
