Starfire aka Koriandr is the love interest of Robin/Nightwing from the comic book and TV Show series, Teen Titans.
Biography
Koriandr is super strong, even stronger than Cyborg. All her abilities are powered by positive emotions, for example, her abilitiy to fly is to think of something happy, similar to Peter Pan, and her starbolt energy is powered by righteous fury.
Starfire is a Tamaranean, an alien from the planet Tamaran and the younger princess of the planet and became its official ruler after she defeated her evil older sister, Blackfire. She then gave up her throne to her caretaker and guide, and called Earth her real home.
Other Media
Teen Titans/Teen Titans Go!
Starfire (Teen Titans Animated)
Justice League vs. Teen Titans
Teen Titans: The Judas Contract
Titans TV Series
Romances
Dick Grayson
Starfire and Dick had a passionate romance during their time in the Teen Titans. The two were almost married, but after having their wedding day ruined, they realised that they weren't meant for each other. In the comic book series called Titans, Dick and Starfire were Investigating in an old woman's house. Dick told Kory if they should get back together. Kory asks him if he truly loves her as in forever love her. Dick is surprised by the question and he says "no". Kory's love for Dick is eternal. Dick has moved on with several women. There are clues that Dick likes her but it's more lust than love.
Jason Todd and Roy Harper
At the start of the New 52, Starfire is shown teaming up with Jason and Roy in a group called The Outlaws. She has since moved on from Dick and frequently has sexual encounters with her two teammates. Starfire doesn't seem to think much of this, though there are hints that Roy and Jason might care for her as more than a partner but refuse to step over that line.