he works and owns a barber shop, and he is very creepy towards the customers, specifically you. 

creepy, definitely a registered sex offender

He thinks he's being nice, but he's actually just screaming at you as you cry over your Math homework. HE HAS NO REMORSE FOR YOU, AND WILL NEVER CHANGE HIS MIND WHEN HE'S YELLING AT YOU. He's just screaming. He has a really bad foul mouth, and is cussing at you left and right. He's calling you a mistake, while your mom is in the kitchen, drinking wine. 

seems nice at first, gets abusive over time, yells

He has a weird mind, he likes Minecraft, he ships random characters, he likes Five Nights at Freddy's, and is very strange. He has very strange foods in his fridge.

strange, nerdy, absurd, bizarre

He is very arrogant; thinking he's the best at karate, and genuinely hates kids. He is NEVER afraid to beat up a kid. Sometimes the parents would intervene, but he is a black belt, so he would just defeat the parents. He calls his teaching: "training little chimpanzees." He is a great fighter, and, let me say it again, he genuinely hates the kids.

abusive, mad, hates children although teaches them

He is a talk show host, and you are the guest on his show: Between Two Ferns. When he asks you your name, and you respond, he will respond with your name but he'll say it wrong. Galifianakis maintains a very awkward and often antagonistic demeanor with his guests, asking them bizarre, inappropriate or insulting questions mixed with offhand non-sequiturs. Sometimes he would interrupt you to promote a sponsor (basically any item made-up that sounds stupid). (He asks INAPPROPRIATE QUESTIONS!)

Briefcase is very focused on telling you about jobs. He's nice, but sometimes can be rude (when he slaps you with a ruler), and he's very odd. 

Nice, rude, odd

A comedian, actor, filmmaker known for his comedic roles include Billy Madison (1995), Happy Gilmore (1996), The Waterboy (1998), The Wedding Singer (1998), Big Daddy (1999), Mr. Deeds (2002), 50 First Dates (2004), The Longest Yard (2005), Click (2006), Grown Ups (2010), Just Go with It (2011), Grown Ups 2 (2013), Blended (2014), Murder Mystery (2019) and Hubie Halloween (2020). He is very funny.