Not much is known about him other than he is an animator and used to work with his friend Joey Drew at Joey Drew Studios 30 years ago.
Not much is currently known about his personality, but Henry appears to sound calm and quiet. He also seems curious and is interested of his surroundings, since it has been 30 years since he has last been at Joey Drew Studios.
Henry wakes up in the Pentagram Room. After he retrieves his axe once again, he chops down boards. His overall objective is to find Sammy's Sanctuary. He is later kidnapped by Sammy, for a sacrifice to "Bendy". But managed to escape and lock the door from behind before entering S3 Vault to meet Boris.
Henry will be back in Chapter 3. Where he will tried to continuing solve the mystery of the workshop after he had the that place thirty year ago then come back and trapped at the basement after accidental activated the Ink Machine that triggered the whole paranormal event.
The following information contains spoilers. To view them, click the [show] tag.
Alright, Joey. I'm here. Let's see if we can find what you wanted me to see.
— Upon starting the game.
Here's my old desk. I've wasted so much time in this chair.
— When approaching the desk at the end of the hallway.
So this is the Ink Machine. Wonder how you turn it on.
Well there's the pump switch alright. That's one hell of a leak blocking the door though If I can just stop that ink from flowing maybe I can get in.
— Henry commenting about the Pump switch
Okay, that should do it.
Hello? Someone there? I know you're in here. Come out and show yourself.
— Expecting for Someone to arrive.
— Encountering Boris at the end of Chapter 2.
As of yet, Henry's surname is unknown, unlike other human characters.
Being an adult, his voice sounds much like in the age of 20-40 rather than 50-70, despite the game taking place after 30 years.
There are some sounds of Henry which can only occur in the prototype version of Chapter 1 but never used in a newer update:
Henry's gasp and sigh sound when encountering the first Bendy cutout jumpscare.
Henry's "I'm getting the hell out of here!" line after encountering "Bendy".
From Chapter 2, at the ritual room, it is unknown how Henry free himself from the rope he is tied with after Sammy getting killed by "Bendy". Although, it is possible that Henry sneakily cut the rope with a knife from one of his pockets.