Personification in The Love Song of J. Alfred Prufrock
Eliot uses personification here to make the yellow fog into a cat-like figure that rubs up against the window panes and lingers in the shadows. This results in a familiar, comforting image that stands in stark contrast to the reality of the fog, which is that it's likely very polluted.
Death personified. A regular footman is a servant who generally admits and waits on guests--the suggestion being that if Death is holding your coat, then you've entered a place where either you're not likely to come out or are on Death's doorstep.