Answer:
Hard to catch, easy to hold. Can't be seen, unless it's cold.
i'm popular for Knuzlocks what am i
What's a place you have left but didn't enter?
You heard me before, yet you hear me again, then I die. Until you call me again.
A dagger thrust at my own heart, dictates the way I'm swayed. Left I stand, and right I yield, to the twisting of the blade.
I'm the source of all emotion but I'm caged in a white prison.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?