Gladiator Voltron as he is referred to in America is a main character from the anime series Lightspeed Electroid Albegas
Q: Wait he's not in any Voltron episode I've ever seen what's with the name?
A: The Voltron toyline in which he is referred to as Voltron II, or Gladiator Voltron, The closest other version of his name in english is Albegas (which is an amalgamation of Alpha, Beta, and Gamma, the three robot mechs which form him) Though the character was almost part of the Voltron series, his episodes were proposed to be adapted as the third installment of Voltron and planned for release prior to the series cancellation.
Modern Version (as seen in Voltron Force):
The cadets of the Voltron force use a three mech combining version of Voltron they have dubbed "Awesome-Tron" this is the modern version of Gladiator Voltron, and the first official version of this Voltron in the animated Voltron continuity. The three pilots of the mechs that compose him in the current series are Daniel, Vince, and Larmina.