Blackfire (Teen Titans Go!)

Blackfire is a major recurring villain from Teen Titans Go!. She is the malicious older sister of Starfire and the heir to the throne as the princess of Tamaran. Blackfire has somewhat of an unmotivated hatred for Starfire, which can best be assumed to be fueled by either some kind of inferiority complex or a pathological need to be better than her. Many of her villainous plots involve her trying to ruin the life of her sister in order to better herself. However, she is also known for doing far more, much worse things than this, as she's been established as one of the most wanted criminals in the galaxy.

Biography
Blackfire made her first appearance in the episode "Mr. Butt", where she came to Earth to visit Starfire. Right off the bat, Blackfire proved to be nothing but trouble, as she was blowing up alien police robots, while she was shackled up in electronic handcuffs. Starfire was stupidly oblivious to the fact that she was on the lam and helped her fight off these alleged "bad guys" to save her sister. Blackfire told Starfire that she was just dropping by to pay a visit to her favorite little sister. At first, Starfire was skeptical about this, having the notion that Blackfire hated her, on account of her bullying her as a child and having completely ignored and shut her out of her life, throughout their entire times as teenagers up until this very point. Blackfire made up a few cheap excuses as to why she did this and insisted that she really loved her sister and wanted nothing more than to be here on Earth, visiting her once again. Starfire bought this and happily reconciled with her sister, who's hype for a family reunion was clearly lacking to everyone, but Starfire, herself.

Blackfire came into the Titans Tower and was immediately greeted with a chilly reception from all of the other Titans. Blackfire was quick to start hitting on Robin, but Robin told her that he had no feelings for her, as he's only attracted to people who are sweet, innocent, and overall, good. This did not stop Blackfire from continuing to pursue him. Starfire told the Titans about how much fun she and Blackfire were going to have now that she had come over to visit. Robin pulled Starfire aside to remind her of who Blackfire was. A galaxy-wide wanted criminal, who has sabotaged her and ruined her life every time she gets involved with it. Being delightfully oblivious and far too optimistic, Starfire believed that this time would be different. She did, however, make the promise that if Blackfire were to betray her again, she would finally put her foot down and dish out onto her the proper punishment.

Blackfire invited Starfire to have a makeover with her. Blackfire dressed Starfire up to look exactly like her, complete with dying her hair and dressing her up in her costume. This little sisterly bonding activity seemed innocent enough at first and Starfire was surely enjoying it so. However, it soon came to light that she was disguising Starfire as herself so that she could send her to jail for her crimes. At this time, a giant alien police robot came up and detected Starfire and Blackfire. Blackfire hid behind the curtain and ratted Starfire out, getting the latter captured by the alien police robot and taken off to intergalactic prison.

After Starfire was sent to jail, Blackfire thought little of it and continued about her day as though nothing happened. She strolled through the living room and watched Robin dance. She admired watching the movement of his butt and even complimented him on it. Robin snapped back at her again, telling her to leave him alone, before noticing that Starfire was missing. Robin quickly assembled the other Titans to dig up the lawn, in search of her body, already assuming the worst. Blackfire calmed them down, by telling them about Starfire's true whereabouts, shamelessly admitting to lying to her, betraying her, framing her, and leading to her false incarceration. The Titans all shamed her for this, stating that they should have never trusted her to begin with. Blackfire admitted that the reason she cared so little about how she mistreated her sister like this is that nobody ever taught her how to be a good sister. The other Titans immediately broke character and saw this as a reason to educate her on how to be a better sister.

Blackfire's first lesson in being a better sister was in listening. Cyborg instructed a rather indifferent Blackfire to hold Beast Boy's hand and listen to his problems in a kind and caring manner, as demonstrated. Instead, Blackfire clutched Beast Boy's hand violently and when Beast Boy complained, Blackfire screamed into his face. The second lesson was in hugging. Blackfire was simply told to hug the other Titans, but when they approached her with open arms, Blackfire would flinch in disgust and punch them all away. All except for Robin, who Blackfire happily hugged, due to her love interest in him. However, being the violent woman she is, Blackfire crushed Robin, while hugging him as she got a romantic thrill out of this. Their final lesson involved all of the Titans dressing up like Starfire and acting like her. It is unknown what this was meant to accomplish, but Blackfire insulted and bullied the Titans for doing this.

Robin finally snapped and yelled at Blackfire, saying that he had no idea how Starfire could ever love her, given the quality of her character. This managed to strike a chord with Blackfire, as she froze in shock, hearing that Starfire actually loves her. Blackfire had a flashback to when she was a baby and she stole a doll from Starfire. Starfire tried to get it back from her at first, but eventually, just let her keep it, knowing that it made her happy and gave her a hug. After remembering this, Blackfire was emotionally swayed and was finally ready to stop her hateful ways and become a better sister. When she told the Titans this, they knew she meant it and they were happy to know that they finally got through to her and were on their ways to start making some real progress.

The next day, Blackfire was a changed woman and she was treating the other Titans with legitimate respect. She gave Raven a makeover, complimented Beast Boy to make him feel better in a time of need, and gave Robin enough respect for the latter to tell her that she's earned the rights to address him as "Mr. Butt". Cyborg told Blackfire that she had majorly improved and that Starfire would be very happy to see her sister again. However, at this time, Starfire had broken out of prison and was now a hardened criminal, bent on getting revenge on her sister and giving her the punishment she mentioned before. Blackfire tried to be nice and apologize to Starfire, proving that she was changed now but Starfire had long passed forgiveness and blasted across the room, punching Blackfire straight in the face. Starfire punched Blackfire through the window and flew across town with her, smashing her through a bunch of buildings in Jump City, before finally crash landing her into the streets, where she planned on unleashing her finishing blow of power onto her.

Blackfire begged for mercy and showed her the doll that she stole from her as a baby, saying that she would give it back. This touched Starfire as she now knew that Blackfire had changed. Unfortunately, Starfire stated that she had also changed and had gone right back to unleashing her supercharged laser power onto her, blowing her up in a nuclear explosion. Blackfire's burnt body was taken back to the Titans Tower with Starfire, right behind her. As Blackfire dropped to the floor, Starfire told the Titans that they had worked things out.