Masafumi Takeuchi, also known by the nickname Take, is a main character in the anime and manga series Bokura ga Ita. He is introduced as the close friend and childhood friend of Motoharu Yano, and his role in the story is defined by his gentle and considerate nature, which stands in stark contrast to Yano's more guarded and cynical personality. Takeuchi is an ordinary-looking young man with short cut dark brown hair and dark brown eyes, and he stands at a height of 178 centimeters. He lives with his mother and his older sister, Ayaka Takeuchi, who is known for her sharp tongue and strong will.

Takeuchi is widely regarded as the kindest character in the series. He is soft-spoken, discreet, and shy, with a calm and patient demeanor. Unlike Yano, he is thoughtful and empathetic, often acting as a source of practical advice and emotional support for those around him. He is also highly observant and intelligent, tending to analyze situations carefully before acting, which makes him a reliable and trustworthy friend. His motivation is largely driven by a selfless desire to see others happy, frequently placing the well-being of people he cares about above his own. This is most evident in his feelings for Nanami Takahashi, as he consistently prioritizes her happiness and wishes for her to be happy even when it conflicts with his own desires.

Takeuchi's primary role in the story is that of a love rival to Yano for the affection of Nanami Takahashi. However, his role extends beyond simple romantic competition. He serves as a stabilizing force within the friend group, offering comfort and perspective to the often emotionally turbulent main characters. His relationship with Nanami evolves from that of a supportive friend to a romantic partner later in the story, after Yano and Nanami's relationship falters. Throughout this period, he remains acutely aware of her lingering feelings for Yano, and he eventually chooses to let her go, recognizing that her true happiness lies elsewhere. His friendship with Yano is complex and enduring; despite being rivals in love, Takeuchi remains a loyal and understanding friend, and he never lets his romantic feelings completely destroy their bond.

In terms of character development, Takeuchi undergoes a journey of quiet heartache and personal growth. He harbors deep, unexpressed feelings for Nanami and carries the weight of having once loved Yano's deceased girlfriend, Nana Yamamoto, a fact that makes his romantic entanglements with his best friend's past and present significant. He slowly comes to terms with these unrequited feelings, learning to accept that love sometimes means letting go. His growth is marked by an increasing maturity and the ability to face his own emotions honestly, ultimately leading him to encourage Nanami to pursue her own path. He does not possess any supernatural or extraordinary abilities; his notable strengths are his emotional intelligence, patience, and his unwavering capacity for kindness and understanding. His ability to offer sound advice and his calm, positive presence are the assets he brings to the narrative.