Ptolemy gives Rigel the nature of Jupiter and Saturn, and the resulting reading is the most benefic in the Orion group: honour, riches, lasting fame, technical and inventive ability, and success won through effort.
The Jupiter half carries almost all of it. The Saturn half contributes caution, delay, and the standing risk of a fall from position, which is the qualification the tradition attaches. The combination of Jupiter and Saturn is a recognisable type in this material, elevation that is slow, earned and precarious rather than conferred, and it appears again with Canopus and, on Ptolemy's reading, with Algol, though the balance in Algol's case is entirely different.
The specific delineation of Rigel as favouring technical and inventive ability and engineering is worth flagging as late. It does not come from Ptolemy, who gives two planet names and nothing more, and it is not obviously derivable from Jupiter and Saturn without a good deal of interpretation. It appears in this form in Robson in 1923 and in the nineteenth-century sources he drew on, in a period when technical and engineering careers were a live category in a way they had not previously been. Fixed-star delineations acquire the professions of their compilers' centuries, and this is a clear instance.
Rigel is not among Agrippa's Behenian fifteen.
Orion as a constellation figure is among the oldest identifiable, appearing in Mesopotamian tradition as the Heavenly Shepherd and being referenced in the Book of Job and in Homer. The individual stars' astrological characters are Hellenistic and later; the figure is much older than the attributions.