Zarathustra's name for the one who creates values instead of inheriting them, the human as bridge rather than destination.
Documented
The bridge in the prologue
'Man is something that shall be overcome.' In the Zarathustra prologue the Übermensch is a direction, not a type: the creator who remains faithful to the earth, invents values after God's death, and can will the eternal return. Nietzsche never depicted one; the concept is a rope over an abyss, not a portrait.
Assessment: Documented: the prologue is the text; everything else is reception history.
Stories
The superman drift
Within decades the word had been borrowed by eugenicists, comic books, and gym posters. The folk version is a stronger man who dominates; Nietzsche's version dominates nothing but his own resentment. The distance between the two is the whole tragedy of the term.
Assessment: Stories: the drift is documented; Shaw, the eugenicists, and 1938's Superman all pulled from the same well.
Interesting claims
The Taoist objection
The comparison the archive keeps open: Laozi's sage also overcomes the herd's values, but by subtraction, water going low, the uncarved block. Two exits from the same room: Nietzsche climbs over the wall, Laozi notices the gate was never locked.
Assessment: Interesting: the structural parallel is real; whether they converge or contradict is the standing question of comparative philosophy.
Sources and further reading
Friedrich Nietzsche, Thus Spoke Zarathustra (1883-85), Prologue, sections 3-4
Walter Kaufmann, Nietzsche: Philosopher, Psychologist, Antichrist (1950)
Dao De Jing, received text, sage passages (comparison)