Westmeath, Ireland, and now currently lives in Brighton, England, though he hasn't done a house tour because he has had trouble with fans going to his house, which makes it unclear if he lives in an office, house or apartment.
In a previous apartment, Jack had a roommate named Killian, and he even appeared in some of his videos, including a vlog and a Turbo Dismount video.
Jack has an energetic personality, and enjoys playing all sorts of games ranging from AAA games, to flash games, with his favorite games being Shadow Of The Colossus, DARK SOULS and Undertale.
She hasn't been shown, appeared, or introduced in any of Jack's videos on his channel.
But she did join Jack and some of his friends - Bob, Wade, and Molly - in his Revelmode charity stream on Twitch when they were playing Overwatch, has been mentioned in a vlog and can be seen in the background with Jack in Pew Die Pie's PAX 2016 vlog and has a few videos up on her own channel.
Robin is the skills behind the Antisepticeye edits, and Jack has publicly thanked him many times for it.
The fanbase created an "evil" Jack, calling him "Antisepticeye." Jack, liking the idea, enlisted Robin's help to add in little glitch edits to his videos to build up the eventual Say Goodbye video on Halloween of 2016.
Jack's friend and editor is Robin, or pixlpit as his online alias.
Robin has appeared in a Worms Clan Wars video as a secondary player, in "Oh Sir...!
He has a girlfriend named Signe (pronounced "seenuh"), whose You Tube channel is Wiishu, from Denmark.
She is a digital artist, and has often posted fanart of Jack on her Tumblr.
Despite his overwhelming popularity, Jack has remained down to earth.
He hasn't let his popularity go to his head, and admits that he doesn't describe himself as a "celebrity" or "famous," as those terms make him feel uncomfortable.
Jack is very well known for his green hair and is the second most popular "celebrity" in Ireland, though Jack has stated many times how being called a "celebrity" makes him feel uncomfortable.