List of models i like with Sonnia is
Witchling Stalkers - Remove conditions, hand out burning, great melee attack. Our best minion overall imo.
Malifaux Child - (Double Flame Pillars is a thing)
Watcher(s) - These are our best scheme models by far.
Francisco - Just all around superstar with El Mayor and usually becomes the focus of my opponents attention
Pathfinder - For Squatters rights and generally i feel this a model an opponent must remove or the game will start going downhill for them in the later turns/
Judge - Another all round henchmen, this guy is just a work horse.
Samuel - I like him, he does one thing only, but hes just so good at that (not many things in the game with weak dmg 4 at range that can ignore los and cover) plus hes even more deadly upclose.
Death Marshall - All round model, a little uninspiring sometimes but occasionally pinebox will win you a game.
Pale Rider - Criminally underated, probably the 2nd best Rider overall. The (0) action is easily the 2nd best out of the riders and mid to late game he can really mix it up and usually survive.
Guild Hounds - Cheap fast models for use in various strats and scheme. Quite pokey for 3 ss in combat to.
Austringer - Deliver Orders, the discard cards trigger and the ability to terrorize enemy totems/scheme runners.
Theres more but those models are probably the bread and butter for me. I still havent really got round to trying everything yet so no doubt that list will change over time (next up is hunters/abuela/exorcists)