He's a son of two members of the original Digital World exploration team. When his parents were doing research on the digital gate, their experimental digital gate malfunctioned and sucked Ikuto into the digital world. After arriving at the digital world, Ikuto was raised by Yukidarumon and then by Mercurimon after Yukidarumon died. After Yukidarumon died, Ikuto swore an oath to be a digimon warrior, sees himself as a digimon, and to hate all humans. Although all of that changed after he met Masaru, Touma, and Yoshino who showed him that not all humans are bad and welcomed him into their family with open arms.