Not a professional here, but I was playing dark magician for a while and tired of not winning I started to create a new strategy and when the Charmer structures came out I decided to get some, because, spellcasters, and this is the best fomula I have so far, still things to Improve
The Idea is mostly to control the other deck while you make your field stronger, the familiar possesed is the main atack power, sometimes your opponent thinks you are always going for the dragoon but if you use Predaplant and go for the Magicalized Fusion, you can summon The Dark Magicians or the Quintet Magician, then the Familiar Possessed links are a good strategy in case you are playing with different types of decks or in case you need an extra body to summon an other link.]
Accesscode is mostly a killer and sometimes you are able to link summon Selene just to bring back dragoon and then summon accescode with a different monster that was on the field.