I think everyone starts their Levi crew with the four SPA, desi engine, waifs and canine remains. That seems like the go to list to start and there is nothing wrong with that list. As you learn the master you will develop your own play style with him and you will then tailor your crew to that play style. Levi has so many choices that you can find a model for almost every situation. Of course this lead to what Karn often calls Analysis Paralysis. Right now I am normally running my Levi crews with two SPA to start and count on making the other two during the game. I have also been using rotten belles to go effect and the dead rider is almost always the first model in the crew. Molly even makes it into my crew from time to time. She has some excellent debuffs, can copy unnatural wasting, and can further support the belles.