Yako is extremely determined to revive Pegasus, not letting anything stand in his way; be it Yugi and his friends or Seto Kaiba . His mentality seemed to be slowly warped by the presence of the Wicked Gods, twisting him more and more as he had been exposed to them over time. He claims that Pegasus was his master and everything to him, and losing him was the worst tragedy that could befall him. He also held great enmity for his twin, Gekko. Gekko was often praised by Pegasus as a "perfect" duelist, and Yako often felt that he was dueling in the shadow of his twin. He failed to realize that Gekko was "perfect" in the fact that he would experience no growth as a duelist, and was as strong as he'd ever be. Yako's feelings for Gekko eventually caused him to use his brother as a pawn in his batt