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Note: Lead (and dense materials in general) are not known for their abilities to absorb or slow neutrons - typically shielding is composed of materials composed of a high proportion of light hydrogen atoms, such as water, wax, or plastic.

IIRC, trapping the neutrons in water or some similar compound is how the power is extracted from a D-T reaction. However, my ignorance exceeds my curiosity.

Mr. Fusion doesn't run on a De/T cycle. It can use a banana peel, beer, and the beer can itself as fuel.

No, it makes no physical sense. Perhaps it's a branding name, since "Mr. Zero Point Energy" doesn't flow as well.

Are the neutrons that fusion kicks off particularly more difficult to deal with than those kicked off by fission?