Alison Severide is the twin sister of Kelly Severide. Being a firefighter is in their blood. And being a female firefighter hasn't been easy. Once they became friends with the police department Alison instantly fell for Detective Jay Halstead. They had a connection but there was only one thing, Jay is engaged.

It's Katrina Harts first day at firehouse 51. Hart Grew up alongside a family of first responders and that's why she grew up to be a paramedic. Katrina is the new PIC ( Paramedic In Charge) after Gabby Dawson left, Katrina already knew Kelly Severide and Stella Kid. Kelly and Katrina went to academy with each other but little does he know his old crush is going to show up and work alongside him. Katrina and Stella met at the first responders gala. Katrina Hart is played by Gabrielle Moses I kept Erin Lindsay in it as I really love her

Jay Halstead's son is missing. What happened to him and will Jay find him in time? (Jay/Erin/OC)

Olivia Lewis is a badass. When she was 17 she joined the army with her best-friend jay Halstead. The best thing they know the shy kid is shooting up the school. Right before graduation. Olivia took her down and got shot. 7 years later Olivia comes back to Chicago and visits her best friend. And their both badass cops.

Ever since Blake was adopted by Benny Severide, and became inseparable with Kelly, she always wanted to be a firefighter. Just like her brother. Recruited straight to Firehouse 51, and onto the same truck as Kelly, life was pretty good. Being the second in command to her brother, she went through the same hardships Kelly did, never leaving his side. Only Blake Severide's life gets a lot more hectic when Intelligence gets involved. Especially when she falls for the former Army Ranger.

For the Casey family firefighting runs in the family! what will happen when Jenna Casey joins the one and only Firehouse 51

After 7 long years away from home, Mia Halstead finally returns back to Chicago after living in New York. An unbreakable bond with one brother and an unsteady bond with the other, Mia finally believes she can start over. But her struggles are never really over. What happens when her past catches up to her? What happens when needs her brother's help? Will she ask him? Or will it be too late?

When an undercover gig turns into something bigger than they would expect. BOOK 1 : UNDERCOVER BOOK 2 : DETECTIVES Highest ranking: #1 - jayhalstead , #20- jay , #2- chicagofire, #1 - chicagopd, #1 - onechicago, #1 - halstead *I do not own anything from the One Chicago Universe. I only own my caracters. *Russian version available on @fleameweaver 's profile.

She was just a singer finding her way. Then it all went to shit. Falling in love wasn't in her plans, Neither was getting kidnapped, but she welcomed it into her life all the same. Jay Halstead met her, loved her and married her. His brother- well let's just say that Will is good at making bad decisions.