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MC has a growing collection from the demons with feathers (including Karasu) AND all the angels (Simeon, Raphael and even Michael somehow).
Mammon gives MC a coin he supposedly charmed with good luck, but who knows if that's true or not.
Levi's too nervous to offer MC something directly, so he rubs his scales/tail against their skin if they fall asleep in his tub. (Let's be honest, he'll sneak into their room at night and do it then if he has to.)
Satan doesn't have feathers, but his feathered boa ends up wrapped lightly around MC's neck more often than not, or he accidentally leaves it in their room.
Asmo probably laced his nail polish with something so MC wears his own little mark each time he insists on tidying up their manicure.
Beel gives MC food that he cooked himself. Who knows what the Avatar of Gluttony could do to food that would make him so determined to feed MC and not eat any for himself.
Belphie is shameless and gives MC dreams every once in a while. MC never remembers the details, only the visceral emotions still coursing through their veins like adrenaline when they wake up: desire, anger, fear, heartbreak.
Diavolo knows MC won't accept the princely gift he secretly wants to offer them, but he recalls how MC admired his horns in his true form. He breaks one of the gold ornamental rings just enough so he can pretend it's no longer wearable, but its still intact enough for MC to keep. (How could they refuse something from a prince?)
Barbatos is slippery like some of the others, literally. He dips his tail into the pot of tea he brews for MC and sweetens it with honey so the taste of his secretion isn't too overpowering.
Solomon might as well be a demon. He invites MC to Purgatory Hall to study or help him with an experiment. They leave an hour or two later with a spotty recollection of what they did during that time, with only the vague sense that Solomon kept them very busy. He waves them away later with a cheeky smile and a reminder to get lots of rest.