WHEN I WAS PLAYING SMT IMAGINE:
Pure Mage character build, focused on Chaos demons because I generally liked those better. Picked Chaos alignment so I dicked myself out of getting an Alice, which I made a secondary Pure Melee character for, which was Neutral.
My main demons at the early stages were usually physical bruisers, supporters or tanks who can take hits for me while I pelt offensive spells at the enemies. Also, a lot of demons that you can get now never existed back when I played. For instance, you can get Hecatoncheires (Lv82 Jaki) and Mara (Lv95 Maou, also the highest levelled demon to date) nowadays.