Hipster Robert is a clone who inherits a rare trait of hipsterness from Robert. He was one of the first clones created and shows a distaste for listening to rules and going to work.
After Feminist Robert's 2nd "death", he volunteered to be part of the 3 clone team to take part in Operation: Diamond City Takeaway. As he was the only Generation 1 clone on the team, he was responsible for providing covering fire for those in the front lines.
He was one of the leaders of the Great Robert Exodus and died (presumably from vertibird explosion) during the brotherhood air raid on Gingerburg in retaliation for the destruction of the prydwen and airport.
Hipster Robert sports a top-hat and wears clothes that he considers "outside the mainstream". His hobbies include: writing poems and thinking about philosophical quotes.
It's hard to say, what does Robert feel about him. When Hipster Robert died, Robert seemed to be very frustrated, but he also said that he never really loved him. However, after all Hipster Robert was the first clone, who was resurrected at the clone lab. So perhaps he actually is one of the favourite Robert clones.