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Nick (ニック)Pastor Nick is a member of a religion that worships the Walls as holy.
He claims that he lost his family as a result of addiction to Vine.
As a religious leader, Pastor Nick used his influence to oppose any modification of the walls, be it permanently sealing the gates or even mounting cannons on the top.
(Source: Shingeki no Kyojin Wiki)
Note: Minister Nick is the official English translation by Kodansha.