Superman Friends and Allies who should return from obscurity

[Doctor Know]

(On the topic of mystical characters, where the hell is the Spectre these days?)

Probably the same place that Phantom Stranger is. Limbo.

A lot of DC characters are in Limbo.

[TruthAndJustice]

Limbo is literally a place in the DC Multiverse. But the Spectre is virtually omnipotent -- he could leave Limbo easily.

And if there was ever anyone who could stand against Dr. Manhattan, the Wrath of God would be it!