Hiromi Tachibana, known in the original Japanese version as Hiromi Tachibana, is a character who joins the narrative during the second season and continues to play a significant role in Beyblade G Revolution. She is introduced as a classmate of the protagonist Tyson and his friend Kenny, holding the position of class president. This role as a leader in her school life heavily informs her initial demeanor, which is characterized as loud, bossy, and stubborn. She is not afraid to argue with Tyson and often uses her authority to keep him in line, such as assigning him detention for missing classes. Despite this tough exterior, Hiromi is a fundamentally kind, caring, and fiercely loyal individual who forms a deep bond with the team. Initially dismissive of Beyblading as a childish game, she gradually warms up to the sport after spending time with the Bladebreakers, becoming determined to understand their world, including the mysterious Bit-Beasts she cannot initially see.

In G Revolution, Hiromi’s personality evolves, becoming more mature and responsible, though she also displays a more violent streak, often directed at the younger team member Daichi. Her role transforms from an outsider to an integral part of the team as their manager and a voice of reason. Unlike the other main characters, Hiromi does not own a Beyblade or possess a Bit-Beast. Her contributions are non-combative, focusing on supporting the team through cooking, cleaning, and helping with strategy and maintenance alongside Kenny. Her cooking is notably poor, a fact that becomes a recurring source of humor, especially with Daichi, who calls her "Grandma" to tease her.

Hiromi’s primary motivation is the well-being and success of her friends. She is defined by her unyielding loyalty; when the original Bladebreakers disband and go their separate ways, Hiromi is one of only two people, alongside Kenny, who remains with Tyson. She stands by him as a steadfast supporter when the BEGA League threatens the sport of Beyblading. This dedication highlights her role as the emotional anchor of the group.

Her key relationships are centered on the members of the G Revolutions. She shares a contentious but deeply caring dynamic with Tyson, frequently bickering with him while also being his most consistent supporter. She takes on a quasi-maternal role in looking after the energetic and naive Daichi. She has a close friendship with Kenny, with whom she shares the responsibility of managing the team. Her interactions with the more reserved Kai are less frequent but significant, with hints of a fleeting admiration in earlier seasons. Her most notable abilities are her intelligence, her leadership skills, and her determination to help her team succeed without ever entering a Beyblade battle herself.