Hekiru Midorikawa is a character from the anime Samurai Flamenco, known for his role as the stoic and analytical member of the Flamengers, where he assumes the identity of Flamen Green, the fourth member of the team. At twenty-two years old, Midorikawa is distinguished by his calm and collected demeanor, which serves a specific function within the group. His primary role is that of the strategist and tactical analyst, a position that leverages his passion for learning and his methodical approach to problem-solving. This intellectual focus is a core aspect of his personality, as he is deeply invested in knowledge and careful planning.

Midorikawa’s background includes family ties to the city, as he has both a sister and a young niece living in town. His affection for his niece represents a significant personal motivation and a point of vulnerability. This caring nature is a weakness that the antagonist Haiji Sawada is able to exploit, most notably by destroying a favorite book of Midorikawa's to manipulate him. His loyalty to his teammates is clear, and during the early formation of the Flamengers, he is shown to be one of the members who more readily follows the leadership of Masayoshi Hazama, the titular Samurai Flamenco and Flamen Red, alongside Sakura Momoi, Flamen Pink.

Within the team dynamic, Midorikawa serves as a grounding presence, using his analytical skills to assess threats and devise counter-strategies. His key relationships are defined by his membership in the Flamengers, working alongside Masayoshi Hazama, Anji Kuroki, Souichi Aoshima, and Sakura Momoi. While he is a follower of the group's benefactor, Joji Kaname, he stands in direct opposition to the villain Haiji Sawada. His quiet dedication contrasts with some of the more volatile personalities in the group, making him a reliable, if reserved, ally.

Following the defeat of the primary antagonist known as Alien Flamenco, Hekiru Midorikawa experiences a notable shift in his daily life. He goes on to attend graduate school, continuing his pursuit of academic knowledge. This new chapter unexpectedly brings him a different kind of challenge, as he acquires a number of female fans. Rather than a welcome development, this attention becomes a source of constant annoyance for him, underscoring his preference for a quiet, focused life over public adulation. His notable abilities are not superhuman, but rather rooted in his intellect; his strategic planning and tactical analysis are his greatest contributions to the fight against evil.