Goyo Guardian is a character version of the card "Goyo Guardian".
He appears as a Super Rare Partner available in Yu-Gi-Oh! Duel Arena, with a default of 5 Rental Points. His partner ID is P113.
He was only obtainable by achieving any Rank from 1 to 50 on the Arena Weekly Win Ratings (Single), by the end of the time period of July 14, 2014, 0:00 (UTC) through July 20, 2014, 23:59 (UTC). Applicable players received him in their Gift Boxes after maintenance on July 23, 2014.
This is further reinforced by the fact that "Extra Net" was added to this character's partner Deck after maintenance on January 21, which has "Goyo Guardian" in its artwork, yet was not used by Tetsu Trudge.