Hey Sparkly!
My answers:

1. You have to know that sleep paralysis is something normal that we expirience each night without even knowing it. When we train our minds we can embrace the sleep apralysis head on. Now there will be a lot of haluciantions because its a state of mind where the body is asleep and the mind isnt. So everything you see in a dream will be in front of you. You will expirience visual, audio haluciantions you may even feel someone touching you. The bad part is when you open your eyes. You must never do that because the image wont be a good one. Yet again if you dont imagine such scary stuff they wont materialize in your sleep paralysis. You just need to stay calm and control your breathing and everything will be fine.

2. Now thats a matter of how much you control your dream. It deppends on what level of lucidity you are. But the answer is yes and no. Because as I said you might not control your dream that good to create a dream character of some sort. But if your dream control is good you will spawn a serial killer behind you. As I said the thing that "moves" things in lucid dreams and sleep paralysis is thoughts. So if you imagine bad things like serial killers or zombies you might have 50% or higher chance of seeing one in a lucid dream or SP. Just stay calm and dont thing of such stuff.

Good luck on your next lucid adventure