Favorite character has got to be Puck, His other name Robin Goodfellow is what they called the devil back in those days, which is pretty awesome. And the name puck sounds like pouk yet another word for the devil.
"I am that merry wanderer of the night.
I jest to Oberon and make him smile
When I a fat and bean-fed horse beguile,
Neighing in likeness of a filly foal:
And sometime lurk I in a gossip's bowl,
In very likeness of a roasted crab,
And when she drinks, against her lips I bob
And on her wither'd dewlap pour the ale.
The wisest aunt, telling the saddest tale,
Sometime for three-foot stool mistaketh me;
Then slip I from her bum, down topples she,
And 'tailor' cries, and falls into a cough;
And then the whole quire hold their hips and laugh,
And waxen in their mirth and neeze and swear
A merrier hour was never wasted there.
But, room, fairy! here comes Oberon"
Pretty much sums this guy up pretty well, this little quote here explains some of the wonderful things our friend here does to people, like "harmless" pranks.
It is very unclear what his goal is, It seems he does what ever he wants, but he is loyal to and serves Oberon, which could be an "obstacle" to what he wants to do.