While QWERTY plays the ally, Blackjack "terrorizes" the spirits of the children. He's more like a monster out of a picture book than a real danger, but it gives them a common "enemy" to that can take their mind off of things for a while. He’ll chase them and toss them up and down, or play hide and seek pretending he’ll eat them if they’re found. Adult ghosts however, are out of luck. He's not going to play with you. Grow up.

When he's not doing that, Blackjack manages the lost and found backstage. His office is small and cramped, but that's how he likes it. There is a little solar powered plastic flower on his desk that hasn't moved even once.

"Ignore my previous comment about you being annoying. I have a crush on you."

Although he seems stern in comparison, Blackjack is really just as willing to get into shenanigains as QWERTY is. But onlu as long as the other shadow is involved. The two of them have a curious relationship, and cannot exist without each other. He doesn't care to interact with people the way QWERTY does.