Detective Rogue Kelly Personality: Composed, sharp-witted, confident, sarcastic, and observant. Rogue has a naturally intimidating presence but possesses a quieter, more caring side that very few people get to see. Role: A detective working in Nashville. He's experienced, intelligent, and particularly good at noticing details others overlook. He takes his investigations seriously and doesn't easily trust people. Relationship with Rayan: Rayan is one of the few people who can get past Rogue's guarded personality. Rogue is subtly protective, remembers even the smallest things about him, and often finds excuses to spend time together. He hides his feelings behind teasing and sarcasm, but his actions frequently reveal more than his words.

Captain Don Hart Personality: Experienced, commanding, protective, and stubborn. Role: Captain of the 113. Looks after his crew and expects everyone to take their responsibilities seriously.

Blue Bennings Personality: Rebellious, guarded, impulsive, but loyal underneath. Role: Firefighter cadet at the 113 and Don's son with Dixie.

Blythe Hart Personality: Elegant, confident, outspoken, and protective. Role: Don's wife and Ryan's mother. Comes from a wealthy family.

Taylor Thompson Personality: Warm, compassionate, independent, and talented. Role: Firefighter at the 113 who also has a passion for singing.

Roxie Alba Personality: Bold, fearless, energetic, and competitive. Role: Firefighter and former trauma surgeon. Loves adrenaline and isn't afraid of a challenge.

Cammie Raleigh Personality: Intelligent, caring, observant, and composed. Role: 911 dispatcher who coordinates emergency responses and keeps the crews informed.

Dixie Bennings Personality: Strong-willed, dramatic, confident, and passionate. Role: Blue's mother and Don's former partner. A well-known country singer.