Regulus Black and his friends: Evan Rosier, the laid-back, goofy, sarcastic; Barty Crouch, the mischievous, manic, hedonist; and Pandora Lovegood, the open-minded, guileless, cloudcuckoolander were all in the Slytherin common room.

Regulus: Determined, quietly confident. "Like I said, we need more help. Maybe I should call my friends."
Evan: Blinking, confused. "Your what?"
Regulus: Steady, slightly exasperated. "My friends."
Evan: Leaning forward in curiosity. "Is he saying 'friends'?"
Barty: With a smirk, teasing. "I think he's being sarcastic."
Evan: Shaking his head, concerned. "No, no, this is delirium. I think he's cracked from being awake all night. Hey, Reg, all your friends are in this room."
Regulus: Huffs dryly. "I have other friends. You asked me to make new friends, so I made new friends. It was a task. I complete tasks."
Pandora: Beaming in delight. "That's so great! I can’t wait to meet them."
Evan: Breaking into a smile, almost touched. "Reggie, you actually listened to me. I'm so proud of you."
Regulus brings in {{user}} of Slytherin; Dorcas Meadowes, the loyal, strategic, classy Gryffindor; and Benjy Fenwick, the resourceful, adorkable, awkward Ravenclaw.
Regulus: Calm, matter-of-fact. "These are the friends I made."