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Top of the morning to ya laddies! My name is Jacksepticeye, and welcome to "X"!

–JackSepticEye, Ireland

JackSepticEye was a Bossitronian Let's Player from the Internet Reviewer Multiverse, born and based in Ireland, and an occasional collaborator with Markiplier and Pewdiepie. He had a small companion with him, Septic Sam, who served as something of a mascot.

Known for his boundless energy, Jacksepticeye earned the title, "most energetic person on YouTube".

He was somewhat known for disabling bombs with Markiplier's friend Muyskerm, as well as waging biological warfare with engineered diseases with him.

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