Despite her beauty, Starfire is joyous, naive, and somewhat insecure, but her naivete is not to be mistaken for stupidity. An alien and an outsider, she is still rather new to Earth and its customs. (For example, she did not understand what a boy meant when he asked if she was "diggin' the scene" when she was at a party, and stated, confused, "I did not know we were supposed to bring shovels.") This leads to much confusion for her and others, such as the awkwardness in casually drinking mustard as a beverage, and thinking cotton candy and cotton balls are the same thing. She takes friendship very seriously, and is easily distressed when others, especially her friends, argue or fight. Starfire is particularly indignant to the point of snubbing her teammates when she believes they do not care for her friendship or company.
She is arguably the most social of the Titans, regularly meditating with Raven
, or lifting weights with Cyborg
. Above all, she wishes to be friends with everyone she meets, and for everyone to get along. She also insists on sharing her own customs with other members of the team (such as providing a crown of raw meat to be worn on one's birthday), but doesn't generally take offense when they don't understand or refuse her. In one instance, she lies about a holiday celebrated by destroying drapery and blows up a window to explain an accidentally torn curtain; an act that barely registers as odd behavior by the others. Presumably because English is not her first language, Starfire speaks without contractions, and misuses idioms (e.g. "Kick the butt!" as opposed to "Kick butt!" or "The mall of shopping" instead of "shopping mall" as well as "lobstery" instead of "crabby"). Additionally, she uses several Tamaranean nouns, such as "bumgorf" (term of endearment towards one's own child), "K'norfka" (parent or guardian), "clorbag valblernelk" (insulting term), "G'lufnog" (bless you; said after one sneezes), and "shlorvak" (dream).
Starfire's personality changed dramatically from her first meeting with the Titans in Go!
. She demonstrated her power and strength as she escaped from the Gordanian ship. While others saw rampant destruction without a cause, Raven saw her trying to free herself from her handcuffs. As mentioned above, it seems Tamaraneans learn language through lip contact, and having gotten what she wanted from Robin, she leaves him with a warning to leave her alone, she flies away knowing full well that the Gordanians were still hot on her trail.
As she fought against the Gordanians with the four other young heroes, her personality calmed dramatically, and she eventually apologized for the destruction she had caused during her escape.
This change in behavior suggests Starfire truly was, at heart, a somewhat friendly, kindhearted character. The reckless behavior seen in the beginning of the episode might lend some credence to why Tamaraneans are so feared throughout the galaxy their strength is not easily matched. It also proves that Starfire, when the time is right, is not afraid to "kick the butt".
While naive, she is extremely perceptive. As shown in Apprentice - Part 2
, while knowing Robin and Slade
had similar personalities, she refused to believe he had gone to be Slade's apprentice of his own accord, spending hours looking for him. Later, she states that she "cannot live in a world where they must fight," showing that she values her friends more than anything.
Starfire cares about each of her friends, but there is one person whom she cares more than anyone on Earth: Robin. Since the day they met both her and Robin have had feelings for each other, which are obvious to everyone including a few villains. There have been multiple hints throughout the show showing how much they care for one another (Sisters
, Date with Destiny
); but Robin and Starfire didn't admit their feelings for each other until the series finale movie Teen Titans: Trouble in Tokyo
. At that time they share a few scenes with each other and have attempted to kiss twice. By the end of the movie, Robin and Starfire finally reveal their feelings for each other and they finally share a real kiss. They are seen the next day holding each other's hands, confirming that they have finally become a couple.