Now, here are some headcanons for the vengeful goat-skulled Russian ex-boyfriend of Girlfriend, Tabi.
1. Tabi has the ability to emit colorful flames from his hands. He calls these "hyperflames", and he often used this ability while performing onstage when he was still human. When he used his hyperflames, his eyes would glow the same color as the flames he emitted. He probably gained this power when he started dating Girlfriend, who used her demon powers to grant him special abilities to help him with his rising musical career. However, he usually kept this ability a secret when he was offstage, because most of his fans thought his hyperflames were only special effects, and he didn't want to freak them out by revealing that they were actually real flames. After he became an invisible man with a goat skull and skeleton hands, Tabi still keeps his ability to emit hyperflames a secret, but is waiting for the right time to use them again, although not just to show them off...
2. When Tabi dated Girlfriend, she used her demon powers to grant him the ability to regenerate himself. This ability would be very useful for rap battles with opponents. Since he was able to regenerate, Tabi became unbeatable and could take down his opponents in rap battles with ease. This is probably why he's so hard to beat during the song "Genocide". Girlfriend would later grant Boyfriend the same regeneration abilities when she first started dating him after breaking up with Tabi.
3. The cat that Tabi and Girlfriend used to own was called Slava, which means "fame" in Russian. Tabi named the cat Slava because he was an aspiring musician rising to fame, and Girlfriend was planning on becoming a famous rockstar like her parents.
4. Tabi is bilingual, being fluent in both English and Russian, his native language. He usually speaks in English, but tends to lapse into Russian from time to time. When his music career was still going strong, Tabi would record his songs in both Russian and English. Even though he preferred to sing in Russian because he thought his voice sounded better that way, he mostly sang in English so his non-Russian speaking audience would understand the lyrics to his songs better.
5. Tabi's last name is Kozel, which means "goat" in Russian. It's kind of ironic and fitting at the same time now that he has a goat skull for a head. But he didn't always have a surname, as he was abandoned as an infant and raised in an orphanage. Throughout most of his life, he was only referred to as "Tabi", but as he got older, he decided he didn't want to be referred to as just Tabi anymore, so he came up with a surname for himself to make it easier for people to recognize him. He settled on "Kozel", because "goat" was one of the first words he learned in English, and he believed that some people would think his new surname would sound cool. He tried it on himself, saying "Tabi Kozel" out loud, and realized it had a nice ring to it. So, he decided to keep his new surname, but only used "Tabi" as his stage name when he started his musical career.
6. When his career kicked off, Tabi wanted to create a symbol for himself so that he would start selling merchandise like T-shirts. He decided to use a goat skull, because he thought it would be cool and easily recognizable. Like his surname mentioned above, using a goat skull as his symbol is both ironic and fitting now that he has one for a head.
7. Tabi is good friends with Ruv, who is Russian just like him. He considers Ruv to be his second best friend (his first best friend being A.G.O.T.I.), as he and Ruv bond over their mutual interests and strong singing voices. Sometimes on weekends, Tabi and Ruv hang out and relax with bottles of vodka. Ruv also taught Tabi his song "Zavodila" (in Russian, of course), which Tabi got down pat. However, even though Tabi knows how to sing "Zavodila", he's unable to shake an entire room by singing it because his voice isn't as loud, deep, or booming as Ruv's.
8. Ayana, Boyfriend's ex-girlfriend, is a huge fan of Tabi. She sees him as her idol (alongside Dalia and A.G.O.T.I.) and she loves his music. Whenever she sees him pass by, she immediately whips out her phone to take a picture. She thinks Tabi is really cool, and really wants to collaborate with him for a song or two. However, she's a little too shy to talk to Tabi in person, and is still trying to work up the courage to ask him if he wants to sing with her. She really hopes that he'll agree to sing either "My Battle" or "Something Spiteful" with her. Ayana has also seen what Tabi looked like as a human, and even though he's now mostly an invisible man with a goat skull, she seems to have developed a slight crush on him. However, she isn't too sure if he'll return the same feelings, as he gave up dating after breaking up with Girlfriend, and Ayana in turn is currently dating Dalia after she came out as bisexual, so she doesn't think a romantic relationship between her and Tabi would work out too well, because Tabi still hasn't gotten over Girlfriend's breakup and Dalia would think Ayana is cheating on her.