Roland:
He will only hug you if you're feeling upset. He is a leader so he has to keep up a reputation, and hugging is not in that. Since he doesn't hug much, he isn't that comfortable hugging, but if it means making you happy, he will hug you till you feel better.
Lilith:
She found it annoying at first, but eventually she got used to it and will just chuckle whenever you hug her out of nowhere. For some reason she always thinks you're upset whenever you hug her, but when you shake your head and say you just want to hug her, she will smile and say that's good before hugging you back.
Brick:
You can't even wrap your arms around him. He loves watching you attempt, sometimes he will even laughing, only shutting up when you hit his chest and tell him to shut it. So he will just wrap his arms around you, claiming you're so adorable.
Mordecai:
He will only allow hugs in private. He doesn't like to hug in public because he knows someone will tease him about it for days about it and he doesn't want that. His hugs are full of love, so it is upsetting that you can only hug him in private since he is always surrounded by people.