Which as yet unseen character do we absolutely have to see and get answer for Season 6? (poll 2169357)

Which as yet unseen character do we absolutely have to see and get answer for Season 6?

Gerald & Karen Degroot

Alvar Hanso (Founder of Dharma)

Magnus Hanso (Captain of the Black Rock)

The mysterious invisible man in the Cabin (Could be anybody, even one of the above)

The Economist

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See this poll on: https://poll.fm/2169357/embed