Season 2 introduced a character who positively embodies the word adorkable. Barry Allen showing up to grin and gawk and geek out over science with Felicity provided a hilarious foil to Oliver, who spent most of their early interactions making fun of Barrys youthful looks and accusing him of being up to no good. Granted, Barrys motives were shadier than he let on, but Oliver was practically sulking about all things Barry Allen. Would big tough Oliver really have bellowed in pain at Felicity patching his wounds if he hadnt wanted the attention? As hilarious as Barry/Oliver was and as precious as Barry/Felicity was, however, the two episodes of Barrys run on Arrow set him up as a character who absolutely had what it takes as a character to become a hero in his own right. To this day, Barrys setup to be spun off is by far the most organic of the entire Flarrow-verse.