drink_me is Rosmerta Winethrop, 7th year Hufflepuff. She's sweet, adores about everyone, and is pretty anti-war herself. She lives in Hogsmeade and her parents own the Three Broomsticks. She's dyslexic, so typos for her are usually done on purpose, and I apologize ahead of time. I think she'd like Sybill, and maybe they could be friends?
fenwicker is Benjy Fenwick, 6th year Ravenclaw and hopeless geek. He plans on being a Healer when he gets out of Hogwarts, he's taken up amateur photography, and he loves all things pirate and dinosaur. He's an odd duck, but pretty friendly.
moredeadlythan is Rebecca Gilligan, the future mother of Blaise Zabini. She's a 5th year Slytherin, likes... very few people to be honest. She's an absolute sweet heart to the people she really does care about and will do anything for them, but to anyone else she's a snobbish bitch that prefers to gossip and make fun of just about everyone. They probably won't get on.
princelingblack is Regulus Black, 5th year Slytherin. He's quiet, insecure, and introverted. His nose is usually found buried in a book of some sort, unless he's hanging out with Andromeda, Meaghan, or Florean. He's the kind of person who changes personalities to suit everyone else around him. Which is something which won't end well for him.