Forget about the Igor and Persona helpers: go to Back Circus Circus, the local ring mage Victor keeps several types of fusions in your recruited demons to guarantee the selection of reinforcements. So there are “paired fusions” where two demons cross and “special fusions” that require one to several specific demons as base materials. Like recent episodes, a variety of different search filters allow you to display many results, including recommended combinations, so as not to start the cross completely blindly.
A decidedly modern system will again allow one to choose freely among the skills to be transferred, with very few exceptions, creating cracking combinations that will ease the toughest challenges. When the demon evolves to a certain stage, he can also give you a gift as a compliment, including a demon crystal with various attributes: once embedded in a piece of equipment, he can choose to increase the strength attribute, reduce MP consumption or unlock other Access to skills – it all depends on the monster that spawned it. All in all, classic but effective, hopefully improving the possibilities for customization. See you at the start of the school year to see if the mechanics are running at full speed.