Dokamon is Eri Karan's Buddy Appmon.
He is voiced by Motoko Kumai also voicing Syaoran Li from Cardcaptor Sakura.
He look like blue robot with spiky hair, a tail, ear-like horns, and small fangs.
He have green eyes and wear metal grey gloves and black t-shirt.
He is cheerful and faithful to Eri, has the personality of a child.
He has a strong and loyal attitude towards Eri, despite her habit of neglecting him and bossing him around.
Eri and others are lured into an ambush by Hackmon and his Appli Driver Rei Katsura, who challenge them for a fight.
Haru, Eri, Torajirou and Rei are attacked by the Ultimate 4, a team of powerful Appmon under Leviathan's that easily destroy both their buddies and AppliDrives. Just as they are about to be killed as well, Yujin and Shutmon appear and face the enemies by themselves to help them escape.
Eri and the others reunite with their Appmons, who do not remember them at all, and are sent to a journey to restore their buddies' memories. In the occasion, they not only reconnect with Hackmon and the others, but obtain each one their own AppliDrive DUO.