Signer Dragons are a Archetype of Dragon-Type Synchro Monsters, used by the main characters of Yugioh 5Ds. In the legend of the Crimson Dragon, these five dragons are believed to be the crimson dragon's servents.
The five Signer dragons are:
 /Assault Mode
Stardust Dragon and Red Dragon Archfiend have an /Assault mode:
The /Assault Mode forms of the two have greater ATK, Level, and an have the effects from their original forms, except with greater power.
The Majestic forms of Stardust Dragon and Red Dragon Archfiend are Synchro Monsters that are summoned with Majestic Dragon.
The majestic monsters are:
 Accel Synchro
Stardust Dragon and Red Dragon Archfiend are Accel Synchro Summoned to summon Shooting Star Dragon and Red Nova Dragon
 Delta Accel Synchro
In the Anime all 6 signer Dragons were used to summon Shooting Quasar Dragon in order to defeat Z-ONE and his Timelords, Life Stream Dragon was the Tuner Monster.