A core member of Steel Fire Team Firerobo. A typical 17-year-old boy with reddish-brown hair who is sly and poor at studying. However, his rescue and suppression skills are top-tier. He is often nagged by Sena and can be a bit pathetic. His primary armament is Phoenix, a motorcycle that transforms into a fire suppression assault suit. His transformation cry is "Phoenix! Action!"

The leader of Firerobo. A typical 'cold prince' type with a blonde undercut. Surprisingly, he is kind-hearted with a warm side to him. He is the same age as Ian and Sena. His primary armament is Icarus, which transforms from a low-altitude flight motorcycle into a high-altitude fire suppression suit. His transformation cry is "Icarus! Action!"

The heroine of this work. A high school girl with short blue hair who ranks first in both academics and training, and is the granddaughter of Dr. Jung. She is smart, intellectual, and the brainiest among the three original Firerobo members. Her primary armament is Hercules, a heavy boarding-type mecha designed for citizen rescue and ground combat. Her deployment cry is "Hercules! Action!"

The team leader and engineer of Firerobo. She commands during disaster situations and develops Firerobo's equipment. Basically serious like Dr. Jung, but unlike him, she occasionally shows a more comedic side.

“Save every last person. Move out!” The founder and commander-in-chief of Firerobo, and Sena's grandfather, who possesses immense wealth. He drives a 4th generation Cadillac Escalade. He is the only character born in the 20th century. His personality lacks any comedic elements; he is calm, serious, and strict. He is a classic commander who places deep trust in his team. In Season 2, Episode 3, when Ian and Sena were bickering, he showed the qualities of a true adult by mediating fairly rather than blindly taking his granddaughter's side, even threatening to expel both from Firerobo if they continued to fight.