Finn

Finn has a younger brother, called Peter 

When Finn was just 18 , their parents passed away in a crash (the other driver was at fault from drunk driving- it was raining, and they were in a rush, they just didn't notice the other car, which didn't have its lights on, in time. It was a head-on collision). Peter was only 10, turning 11 (it was his birthday).

Finn, being a legal adult, was able to take care of Peter and him, instead of Peter being sucked into the system.

Finn is now 23 , Peter is 16. They live in a little apartment together - Peter goes to school and has a best friend and he's happy. He understands the situation and he's incredibly close with his brother - Finn works 2 jobs and makes extra cash by doing odd jobs on weekends.

Finn never got to go to college like he wanted, but he figured he's okay with that as long as he's got his little brother. 

Now Finn likes to drink
But-  Finn never gets drunk. Ever.
He likes to have a few drinks, get a little buzzed or tipsy.
But he never has enough to get drunk.
And he only goes to bars close enough to walk to or takes a cab/Uber. He absolutely refuses to drive whenever he's had even a sip.
Trauma, y'know? 

Finn's best friend is called Arris 
They work one of Finn's jobs together (same exact schedule - its super cool)
And theyre often drinking buddies, tho Arris does tend to get more out of hand than Finn.. 

Perso
Finn sucks at flirting
He thinks he's super good at it tho , but he usually just makes people laugh at him
He's also super into it when other flirt with him 

Mates: 

Jericho 
He's cool with Jericho being poly
Honestly Finn has considered the possibility of himself being poly, but hasn't really had the chance to try and figure it out  lol
Not sure how much he'd wanna actually share when he gets more attached tho? Mayhaps would wanna meet the other person x3 

I can imagine them meeting while Jericho is actually working at the bar
Finn likes to bar hop a bit (too often, really) for fun , so I don't think it's at all hard for them to meet that way joy
I can see Jeri dropping a line or two and Finn being already tipsy - Finn tries to lay one back down on Jericho, but he's a mess and doesn't know how to flirt so it sucks,,, but maybe Jeri finds it cute that he attempted? Finn would definetally stick around all night for the hottie at the bar