X Brothers

X Brothers (X兄弟, X kyōdai) are the group made of the X Family.

End of Creation Arc
The X Brothers, Delta X, Delta Lee, Melk and Fuuma were orphans of the X Clan. They were adopted by Queen Cyclone and was loyal to Thunder Strike to face the Deadly Battleship, the Black Demon. After Kuro no Mikoto sealed away the Black Demon, Kuro and Asahi went on the Mission given by the Queen, is to capture a Giant Scorpion Cake in the Eastern Beach of America and bring it to her Palace which Kuro no Mikoto and his team completed it.

Trivia

 * The X Brothers are similar to Paul Gekko and his Siblings.