Satan

The word behind Satan means adversary or accuser, and in the earliest material it functions as an office rather than a name: a figure within the heavenly court whose task is to test and to bring charges, acting with permission rather than against it. The famous wager over a righteous man is of this kind — the accuser proposes and is allowed, within limits, to proceed. This is a considerable distance from the later figure, and the development between them happens gradually and unevenly across a long period.

Later tradition consolidates the office into a person and supplies a backstory: a rebellion in heaven, a fall, and in several strands a motive of jealousy at the honour paid to the newly created Adam. Passages originally about earthly kings are read as accounts of that fall, and a range of names — the accuser, the slanderer, the light-bringer, the prince of this world — are drawn together onto a single figure. Folk tradition then adds its own layer, and the familiar bynames that appear in the reference literature belong mostly to that layer rather than to scripture.

Across all of it he remains bounded. Even at his most powerful he is permitted rather than sovereign, works by temptation, accusation and deceit rather than by force, and is understood to be defeated in advance. The folk material makes him considerably more approachable — outwittable in bargains, comic in places — which sits oddly beside the theological figure and is one of the reasons the tradition around him is so uneven.

The paragraphs below are extrapolated; no source supports them.

Read as a personality, Satan comes across as forensic before he is malevolent — the earliest layer gives a prosecutor who wants a case tested, and something of that persists into the later figure's preference for temptation over force. He reads as attentive to weakness in a way that requires close observation of the people he works on, patient enough to wait for the right moment, and vain in a manner the fall-narratives make central. The folk layer's outwittability suggests something over-confident rather than careful.