Here's the gig! When you post, you get to make fun of the previous poster all you want, preferably using real quirks you've noticed. Don't be rude or crude, but do be ruthless. However, once you've done it, you've simultaneously put yourself up for some roasting! The next poster will make fun of you. If you're someone who has seldom or never posted before, we'll make something up about you. The only additional rule I'd say is "No tagbacks." You know what I mean by this? If someone gets you, you cannot immediately retaliate. You may only roast someone who has roasted someone else. Besides that, however, your participation is only limited by your sensitivity!
And by being the first poster, I have thus placed myself on the sacrificial altar. Have fun!