The lower left animal is a bat, as suggsted above, and used as symbol of luck, because it has the sound "fu" just as the word for luck. It's often used on weapons, often on straight swords.
The ones you mention could maybe be associated with the Eight Immortals, popular taoist deities, you can google on that. I think at least the deer makes sense in that context, maybe the leaves and the bird to, not sure, check up. But the ear shaped thingy... a symbol of Mickey Mouse?
