Julian:
He bear-hugs you, picking you up and spinning you in circles. He does this especially when he knows you're upset, because it makes you laugh.
Mario:
He'll study your face for a while, having a fight with his subconcious to see whether or not you want a hug. Finally, he'll wrap his arms around your waist, neither tightly nor loosely, and bury his face in your hair.
Jovani:
His arms hang loosely around your waist, so he can lean back and kiss your forehead.
Hunter:
He'll do it out of nowhere. He'll kind of fall into your arms and hold you tightly. He'll bury his face in your hair and murmur sweetly into your ear.
Geo:
He'll wrap his arms around you loosely, so he has room to back up and peck the tip of your nose over and over again, and for you to see him making silly faces at you to make you laugh.