I wonder, is the fact that they posted on a Chinese platform significant? A potential connection : Monk class > Buddhist monks > Buddhist monastic practices mostly found in Asia (Tibet, East Asia and South Asia) which includes China.
Or, is it the relation to Halloween that significant? Then, the connection might be : A) Panel from Hell > Hell > Monsters and devils > Halloween. B) Paladin > Fighting evil (typically) > Monsters and devils > Halloween.
I guess that's not helping with so many possibilities 😅
If so, it could be a Shadow Monk or something completely surprising instead of the expected Monk / Pala the Blood Hunter is around the corner... Order of Lycan and Order of the Ghostslayer would definitely fit Halloween thematically. But I would prefer to see the Profane Soul subclass.