OK, so this is how it works. Every new person starts an original character of his own, and he/she has to tie the character in with the original story somehow. Every person then writes one para as the story progresses focusing on their character but may include others' characters.
¬ The characters have to be life-like. If you like, you could pick one dominant emotion as the defining characteristic of your character and then give it a background as to why he/she is that way. Not necessarily evil/negative emotions.
¬ When you include others' characters, make sure they act consistently and remain in character. For head-on fights, I ask the community to figure something out and then tell cuz I can't figure out how 2 people would go about head-on fights impartially...
Thats all I can think of right now....
EDIT: As there are no replies, I am gonna try to do the whole story myself.....I have nothing planned or anything, and this is gonna be notoriously slow, so bear with me....