Over the course of 13 seasons, Chicago Fire has introduced dozens of compelling characters — from daring firefighters to compassionate paramedics — each leaving their own unique mark on Firehouse 51. The NBC procedural drama, created by Michael Brandt and Derek Haas, serves as the beating heart of the One Chicago franchise, and its success wouldn’t be possible without the unforgettable personalities who bring it to life.

From day-one legends like Chief Wallace Boden and Matt Casey to newer standouts like Violet Mikami and Darren Ritter, these are the characters that have risen above the rest — through courage, compassion, and deeply human flaws.

10. Darren Ritter
Daniel Kyri’s character brought a fresh, youthful energy to the team, quickly growing from a nervous rookie to a dependable firefighter. Ritter’s LGBTQ+ identity is handled with honesty and pride, offering much-needed representation in the firehouse and the franchise as a whole.

9. Stella Kidd
A later arrival, Kidd (played by Miranda Rae Mayo) has more than earned her place. As Truck 81’s lieutenant, she’s fearless on the job and fiercely loyal off it — a character who continues to inspire viewers through her leadership, resilience, and community work.

8. Joe Cruz
Joe Minoso’s Cruz remains one of the series’ most consistent emotional anchors. From rough beginnings to a stable career and family life, Cruz’s evolution is one of the most rewarding arcs in the series. He’s loyal, brave, and always puts the team first.

7. Sylvie Brett
Though Kara Killmer exited in season 12, Brett’s decade-long run left a lasting impact. She was one of the most capable paramedics in Firehouse 51’s history, combining medical skill with emotional intelligence — and finally found happiness with Matt Casey.

6. Kelly Severide
A brooding hero with a complicated past, Severide is as skilled as he is emotionally conflicted. Played by Taylor Kinney, he has anchored some of the show’s most gripping storylines and remains a fan-favorite due to his intense loyalty and raw vulnerability.

5. Matt Casey
The moral compass of Firehouse 51 for many years, Jesse Spencer’s Casey led with quiet strength and integrity. His absence is still felt in every episode, and his recent return to marry Brett offered the closure many longtime fans hoped for.

4. Wallace Boden
Few characters command respect like Chief Boden. Eamonn Walker’s portrayal is the embodiment of leadership. Though no longer a series regular, Boden’s new role as Deputy Commissioner ensures he’ll continue to influence the department — and the show.

3. Brian “Otis” Zvonecek
Otis was the soul of Firehouse 51, and his season 8 death remains one of the most gut-wrenching moments in Chicago Fire history. Funny, loyal, and brave to the end, Otis represents the best of what the firehouse stands for.

2. Christopher Herrmann
A gruff-yet-lovable mentor, Herrmann (David Eigenberg) is the everyman firefighter — honest, experienced, and deeply rooted in the firehouse. His bond with his crewmates, especially Ritter, shows his growth as both a leader and a father figure.

1. Leslie Shay
Though only with the show for two seasons, Shay’s impact endures. Her intelligence, fearless nature, and unwavering loyalty made her one of the show’s most beloved characters. Her tragic death still resonates — a testament to Lauren German’s unforgettable performance.