catamcgee

Maybe this is the obvious choice, but I think that the best New Chairman option would be the one that was planned for the canceled 3rd season: former ghost hunter, Ollie Chen!

Scratch has (unintentionally) proven that a Wraith can make for a better leader of the ghost world, bringing fresh ideas and a greater degree of kindness to the dead. Ollie is also just as community-minded as Molly, and has his family/friends available to help him deal with dangerous ghosts. And now that they know that spending too long separated from your body can cause memory loss, I'm sure that he and everyone around him would be mindful of not letting him work for too long. He'd probably keep to a strict schedule, which the Ghost Council would find refreshing.