Each bullet point yields a distinct word.
My animal torments you in sleep.
Big or small, she is feared by all.
You may choose to laugh her off,
but she's not so easy to forget.
I preside her alright, however
she is not entirely bound to me.
She might too come
when my opposite occupies.
A black blob in lunar froth I am.
Be my fruit, and cherished you will be.
I shout, when you are sad.
You keep me out, when you're on guard.
Bat me, when capturing hearts is your intention.
Back is at my start;
red marble rolls after.
or else you are stuck forever...
What are we?