Well Worf originally was a member on the I.S.S. Enterprise crew in the novel, so either he will still be the beaten down Klingon from a race that has lost it's honor and still in star fleet that holds him down, or I may have him be a resurgent Klingon that is fighting against the empire.
As for Gary Mitchel I see him still lurking around on Kirk's Enterprise. Just not with the god powers.
As for Dukats daughter I don't see her being in the Dark Mirror universe.
I will do the Ent-D eventually, but not just yet.