Now that's indeed a new and interesting take on the matter of Tom, nice thread idea!
How do I percieve Tom Bombadil? Seeing as some fellow Downers have a habit of likening me to him, that may turn out to be quite a self-searching question.
I do find him a bit unnerving in the sense of annoying at times with his "hey dol, ding-a-dong", even though the poetry of his songs doesn't ring nearly as atrociously in my ears as it apparently does in many others - it's a bit silly, but that's OK, there's also beauty therein. But all these merry nonsense-rhymes are just a surface phenomenon, we soon get hints that there's much more to Tom - not that the jolly, um, Tomfoolery is deceptive, mind you, it does express an aspect of his true being in my opinion, but don't ever think for a moment that's all. It's just like bubbles on the surface of a deep, deep stream. (Weird metaphor, seems more fitting for Goldberry, but that's how it came out of my keyboard.)
"Something inhuman trying to look human", I agree with that, but not to deceive, I think, rather to accomodate: he takes a form that won't scare the hobbits, a form they'll feel comfortable with, while still preserving some of his alienness (note that he doesn't quite look like a hobbit nor quite like one of the Big Folk to them!). It's an act of courtesy. No doubt he looked quite different to Gandalf, and Goldberry too.
"Chaotic trying to seem good"? Nah, don't think so. He's living by laws of his own choosing, but those laws he abides by, such as not leaving his circumscribed realm. If anything, he might be neutral good, but ultimately good or evil seem to have no more meaning with regard to him than a hill or a brook or grass can be called good or evil. What he doesn't seem to be is hostile to any living thing as long as it minds its own business and leaves other living things alone - he tolerates Old Man Willow in his realm - , but if it does overstep its bounds he knows how to deal with it on its own terms (q.e.d. Old Man Willow again). He actually reminds me a lot of these words of Frodo's, even though they were made referring to Gandalf:
with bird on bough and beast in den
in their own secret tongue he spoke.
Pretending, misleading, malignant? No. Tom Bombadil is who he is, always - or as much of himself as the other person is able to grasp.