It's not scenes from the BW's own life, is it?
I'm almost inclined to think it's Gollum.
"Steals taters from confused Gaffers" - maybe he did something like that when he first got the Ring.
"Wonders about the system" - Well, Gollum did wonder when he was kicked out of his hole.
"Is stalked by petty dwarves" - Didn't Gollum wander the streets of Dale? Maybe some dwarves followed him there.
"Likes terrorizing wood elves" - I imagine he partially liked being the "New shadow in Mirkwood"
"Misplaced by a forgetful Maia" - Gandalf once hunted him, had his track even, but then left off.
There are a few things to think about. Was there a "confused gaffer" in LotR? Are they "Petty Dwarves" as in Noegyth Nibin, or as in Dwarves who are petty? And "likes" terrorizing wood elves. Was there a forgetful Maia?
{edit: Oh gee, should've read HI's last post more thoroughly...
}