Ultraman Agul (ウルトラマンアグル, Urutoraman Aguru Ultraman Agul?) is the first full blue bodied Ultraman in the Ultra Series who debut in the Ultraman Gaia TV series. He holds the Power of the Sea, and throughout the course of the series, Ultraman Agul is sometimes a rival, sometimes an adversary, but eventually a teammate, of Ultraman Gaia. Dark and menacing in contrast to the red-and-silver Ultraman Gaia, Agul originally only showed an interest in defeating monsters that threaten the Earth itself, without any consideration for human lives that he may endanger in the process just like his human host Hiroya Fujimiya. However he was more sympathetic to creatures native to Earth, this stemmed from Fujimiya's misguided belief that mankind would be the source of the world's end.