john constantine x emo!gf!reader — headcanons.
he'll buy you whatever dark clothes you ask him for. you are his baby doll, after all! he'll spoil you to high heaven with little goth trinkets or new emo outfits. all that he asks for is a little bit of "spoiling" from you in return...
he knows that you're not just "in a phase", and he'll (quite literally) lunge at anyone who may suggest otherwise. like your parents or siblings, for example.
if you're having a day of depression, he will quickly catch on and do what he could to support you through it. he'll say reassuring things to you, make you your favorite little snack and cuddle with you during a movie, or he'll even let you have your own alone time if you decided that's what's best.
when you get your nails done a new color (even though they're usually black), he'll admire them along with you. he'll even bring the back of your hand up to his lips and press a soft kiss onto them, a silent way of him expressing that you were his — and only his.
at the mall while out on your weekend date, he'd take you in the dressing room of the mall's spencers (or hot topic) and take in every second of you stripping down the one skirt you were just wearing to replace it with the new one you were considering to buy then.