Harry: Harry will wait patiently for you to finish what ever your doing but if he really wants your attention he will hug you tightly. 

Ron: He will just receptively say your name, over and over again until you finally pay him attention. 

Draco: Draco will just stair at you. He'll sit in an armchair, doing absolutely nothing and stair at you until you look back at him. 

Fred: Fred'll pock you in the ribs repetitively until you look at him. If you continue to ignore him then he will refer to tickling you.

George: At first, George will wait. That is to say, until he gets bored then he will start making strange noise and distracting you.

Seamus: Seamus will try to make a small explosion to get your attention but it will usually go wrong and result in the two of you covered in soot but laughing non the less.

Neville: Neville will gently hold your hand and give it a soft squeeze, letting you know that he wants to talk.

Young James: James will go all out. He'll shout, make objects zoom around the room but his personal favourite was to lie on you. Whether that may be laying his head on your lap or full out lying across your body. 

Young Sirius: Sirius will wait for a while but if he feels like your taking to long he'll start to shout random things as loud as he possibly can.

Young Remus: Remus will be respectful to what your doing but he will come and rest his head on your shoulder, letting you know that he's there and ready for cuddles.

Newt: Since Newt is so shy he'll just lightly tug your sleeve and wait for you to respond, if you don't then he'll sulk and feel as if you don't love him anymore. After your finished you go and find him, usually in the forbidden forest and talk to him.