The protagonist of The Brave Express Might Gaine, he is a bright and cheerful young man. He is the president of the massive Senpuuji Concern and the leader of the Brave Express Team. His primary craft is the Might Wing, a 500 Series Shinkansen with flight capabilities.

A transforming train equipped with a Super AI capable of feeling emotions. His vehicle mode is a 300 Series Shinkansen. He serves as the leader figure of the Brave Express Team and is Maito's inseparable partner. His weapon is the Gaine Shot, and he is partners with the Battle Bombers.

A member of the Battle Bombers that transforms from a 200-2000 Series Shinkansen into a lion robot and a humanoid robot. He specializes in hand-to-hand combat.

Transforms from a Narita Express 253 Series train into an eagle and a robot. He excels at aerial combat. His signature technique is Bird Sonic, which emits 60,000Hz ultrasonic waves.

Transforms from a Limited Express Super Hitachi 651 Series train into a Tyrannosaurus. He specializes in land and underwater combat. His main technique is Dino Blizzard.

Transforms from a 100 Series Shinkansen into a Triceratops and a robot. He uses missile-based techniques called Horn Launchers.

The heroine of the story, a middle school student. With her father hospitalized due to illness, she supports her family alone. She is a typical shy manga girl who harbors a crush on Maito. In her heart, she is already married to him.

The combined form of Gaine. When Gaine merges with the Locomorizer, a blue steam locomotive support mecha, they become Might Gaine. The Might Wing forms the right arm, and Gaine forms the left arm. His signature entrance line is: "Carrying hopes on silver wings, let the green light of peace shine! Brave Express Might Gaine, arriving right on schedule!"