Perhaps that’s why nobody expected him to get killed off so early.
Viserys was definitely not a likable character: he insulted, beat, molested, and even sold his sister for his own personal benefit.
He went as far as to marry her to Khal Drogo only so he could get a Dothraki army in order to reclaim Westeros for himself.
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But as it turns out, Drogo was the last person Viserys wanted to meet. He clearly stepped over the line when he threatened Daenerys and her unborn child, which made the Khal pour molten gold on Viserys’ head.