Intriguing "Game of Thrones" Minor Characters

Which intriguing "Game of Thrones" minor* character would you liked to have seen receive more screen time and been more developed? * appears in less than 50% of GoT episodes and averages less than 1 minute screen time per episode

SPOILER ALERT: Intended for viewers current through the 2017 season as poll reveals Game of Thrones (2011) minor characters through end of calendar 2018.

Discuss the topic here or Take other GoT polls.