Welcome to the best master in the stand-out faction of this game
If you only have the box set (I'm assuming you are M2E) then you'll want something to hit people with. Sybelle is okay, Seamus is better but you'll want something a lil less valuable to throw in when the Belles lure there targets in. I suggest Punk Zombies or a Flesh Construct. Both hit hard and have some staying power, allowing Seamus and Sybelle to carry on 'bout their business.
Since Malifaux is more about getting
VPs from strategies and schemes than outright killing, I look to Canine remains with their high movement and relatively low priority target status to nip round and place scheme markers, do the breakthroughs or anything that requires relocation of models to achieve success.