User blog comment:KillRoy231/Mary and Lucifer to return/@comment-10889355-20170620051110/@comment-1975828-20170625194300

I don't know about Castiel losing popularity. I hear some fans dislike the way he was written in Season 12, but that didn't stop a lot of fans from mourning his death, even after they knew he was coming back.

I believe Castiel's fanbase is still pretty massive at the moment. :/