Positives:
* Attractive and popular: He's described as handsome and athletic, and seems to be popular with girls.
* Confident and assertive: Stradlater is confident in himself and his abilities.
* Charismatic and charming: He's able to win people over, as seen by his ability to easily get dates.
Negatives:
* Self-centered and inconsiderate: Stradlater often ignores Holden's feelings and needs. He borrows Holden's things without asking, doesn't care about Holden's opinion on his date, and is generally dismissive of Holden's anxieties.
* Superficial and shallow: He cares more about appearances and popularity than about genuine connections. His relationship with Jane Gallagher, for example, seems to be more about physical attraction than genuine affection.
* Dishonest and manipulative: He lies to Holden about his date with Jane and is often deceptive about his intentions.
* Arrogant and condescending: He often puts Holden down and belittles his interests and opinions.
Overall, Stradlater represents the type of person Holden despises: someone who is superficial, self-absorbed, and doesn't seem to value genuine connection. He serves as a foil to Holden, highlighting Holden's own insecurities and his struggle to find meaning and authenticity in a world he feels is phony.