Fire Brothers (Japanese: ファイヤー兄弟 ) are 99-year-old twins which making them the oldest contestants in the history of Mars’ Brightest.
They are two skinny old men in suits and small hats. They are bald on top, but have hair on the sides and have sideburns with long beards, big eyebrows and not many teeth left in their mouths. They both wear a bowler hat, a black suit, and tie, and black shoes.
Despite being very old and senile, when it comes to performing their music, they take on a more serious and hot-blooded persona.
The Fire Brothers were in the dressing room at Mars' Brightest Competition when Carole Stanley and Tuesday Simmons came. They were later introduced on the stage and as their turn came, the host tried asking them some questions, but since their age, they weren't able to hear him and answer. Then they performed their "Never Die" song, surprising the judges with their growls and high pitch voices. While performing the taller one injured his back, and the shorter one burned his hand from the guitars pyro effects.
After their song, Benito was surprised by their song's energy and youth. Catherine told them their performance made her forget their age, but they looked like stuck in the past and haven't evolved, so they decided Pyotr was the winner, eliminating the Fire Brothers.