This specific character literally places a person right under the symbol for a roof or house. Because they are just staying there without any task or chore, it directly represents the concept of being ‘unnecessary’ or ‘redundant’.
As you can see, this character clearly represents ‘up.’ It features a baseline resembling a table, with a distinct symbol indicating something positioned right above it.
Just look at the character—you can find an UMBRELLA exactly as it is in this shape! The top forms the wide canopy, the internal strokes look like the rib skeleton, and the center line is the handle. It is a perfect, literal pictogram of an umbrella!