I think the old Shadowline's "Doctor Zero" would be a great adult-oriented streaming series.(the idea of a sociopathic, opportunistic, mass-murdering superperson who knows how to manipulate his public image was ahead of its time) It would need more than 8 eps a season though as that concept needs a slow burn. (I'd also throw in "St George" as a developing background antagonist, which is why it would need at least 12 episodes per season)