Jacksepticeye has six alter-egos, or seven if you count the fan-made character "Robbie the Zombie" Possibly all the way back in 2010 to 2012 Jack began dating a Korean girl he got interested in and found online.
They were both at different locations so it was hard for them to closely communicate.
He is known for his energy, distinct accent, loud commentary and yet sometimes gentle nature and (now former) signature green hair (which he dyed for charity alongside Markiplier).
When he was still in school, he got a severe injury to his eye which later became infected, and his friend began calling him "Jack Septic Eye", after figuring out that Seán's mother called him Jack. He lived in the countryside with his parents as a kid, though later on moved with his family to a cabin in the woods.
Jack is the youngest of five, having two brothers and two sisters.
He is also an animator that has made several animations for Jack, and others such as Pew Die Pie, Markiplier and the Game Grumps.
Robin is the skills behind the Antisepticeye edits, and Jack has publicly thanked him many times for it.