Musashi Kazama resided in Tokyo with his father after his mother's departure three years earlier, clinging to hope for her return. Relocation to the countryside sparked deep resentment, fueled by fear his mother couldn't locate them. Witnessing a man lure fishing for bass ignited a profound fascination. Discovering his maternal grandfather was a legendary bass fishing champion offered newfound purpose, linking angling to the potential rediscovery of his mother. This connection unleashed his passion and innate talent for lure fishing, transforming his disdain for rural life into an appreciation for nature.

He embodies an honorable and enthusiastic personality marked by fair play and reckless impulsiveness, especially concerning lure usage. A strong ethical code underpins his actions, emphasizing deep care for fish welfare and environmental preservation, aligning him with figures like BB and Masatsugu Hattori. While rarely planning ahead, his genuine excitement for fishing and competition fosters camaraderie, ensuring rivals and friends enjoy the experience. His journey involves maturing from a nature-averse city boy into a champion of ecological balance, understanding the responsibility accompanying powerful tools like the Legender lures.

His fishing journey began under mentor Miracle Jim, who introduced fundamental techniques. Key equipment includes the **Grander Tackle**, capable of restoring natural environments, and its enhanced form, the **Giga Blade**. Primary lures feature the **Orckaiser** (a topwater lure), its upgraded **King Orckaiser**, and several Legenders: the sunlight-controlling **Hawk Legender**, the versatile **God Legender**, and the **Shark Legender**. Mastering these demands recognizing unique properties—like the God Legender's ability to control other Legenders—and mitigating risks such as the Hawk Legender's energy instability. His progression from basic lure fishing to wielding Legenders signifies his evolution into a "legendary fisher."

Close bonds define his relationships. **Mio** and **Suguru** are steadfast village companions; Mio offers unwavering support despite occasional jealousy, while Suguru combines technical lure-crafting expertise with lighthearted rivalry. Key rivals include **BB** (Dragon Legender bearer), sharing his environmental values; **Carl Amann** (Shark Legender), initially ruthless but later reformed; **Yun** (Scissor Legender), a deceitful loner who adopts fairness; **Masatsugu Hattori** (Spider Legender), an honorable ninja protector; and **Kuki Jr.**, corrupted by the Devil Legender stemming from underhanded tactics. These relationships fuel his competitive drive and ethical growth.

The narrative spans two primary arcs. Global expeditions with Mio and Suguru in the initial season solidified his love for nature and unveiled his familial legacy. The subsequent RV season centers on a worldwide quest for the seven **Legenders**—legendary lures granting world-altering power. Amid rival fishers, he secures the **Hawk Legender** and later the supreme **God Legender**. This journey demands balancing ambition with ecological stewardship, particularly as Legenders like the Angel/Devil variant reflect the wielder's intent—corrupting Kuki Jr. until his redemption transforms it. Confrontations with antagonists exploiting technology or nature, such as Kuki Sr.'s group, reinforce his commitment to protecting "Mother Earth" from human greed.

Family revelations further shape his path. His grandfather, **Genji Takegami**, is revered as the "King of Granders." His mother, **Ayuko Kazama**, remains a motivating absence. His father, **Takehiro Kazama**, supported their relocation, though parental relationships receive minimal elaboration. A 2020 one-shot manga commemorated the 20th anniversary, though specific character contributions within it remain undocumented.