Mach Sperion is a Holy Brave whose mechanical body was created by V.A.R.S, he is formed from the Phoenix Combination of Sperion and the Mach Phoenix. He can then combine with Baan Gaan (Baan + Gaan Dasher to form Great Baan Gaan.

As Sperion was temporarily captured and turned into the representation of despair, Guildion, Mach Sperion is in turn transformed into Dark Guildion before being reverted back to normal. In Brave Saga 2, however, Guildion broke free from Sperion and became a separate entity, which also applies to Dark Guildion.

Mach Sperion is a further and greater embodiment of hope, triggered by his "Fountain of Hope", Hiro Sakashita's shout "Fire Charge!", followed by a signal beam emitted from his Mach Trigger, initializing the combination. Similar to Baan Gaan, Mach Sperion can exert his full performance when combined with his source of power, in this case, Hiro, by fusing with the human boy, although the tractor beam pulling Hiro up for the merging is now released from Sperion's chest before forming Mach Sperion, as opposed to how the combined Baan Gaan merges with Shunpei with a beam from his forehead.