Gennai

Gennai is a being of data with the appearance of an older man. He is the one who called the Digidestined to Harddrive, and the one who tells them how to get back home. He officially reached "Creepy old man" status when he told the Digidestined that he was "an old man who's been keeping an eye on you".
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==Arc 2==
At the start of Arc 2, the Digidestined get a mysterious note from a person calling himself Gennai.
The digidestined heed his call and head for Harddrive, but it is only after they fail to make it through the portal to the real world in time that they meet Gennai. He mentions something about the previous digidestined, then explains that they need to activate the power of their crests in order to open and get through the portal.