From my little experience with playing Molly;
Dead Doxies are great for pulling and pushing your slower models around into position; Drowned, Punk Zombies...
Speaking of Punk Zombies, summoning them in the enemies face then using Molly's (0) Action on the Forgotten Life upgrade to make it attack with a (1) action - then Chain Activate said punk for another (1) melee!
Drowned are great tarpits for holding objectives and as both Horrors and Spirits they are useful for either variant of Molly crew. I also really like the models as well!