When Mako Iwamatsu spoke, audiences didn't just hear dialogue; they felt a lifetime of lived experience, warmth, and quiet authority. Born in Kobe, Japan, before emigrating to the United States, Mako carved out a five-decade career that bridged traditional theater, on-screen film work, and iconic voice acting. While many remember him best as the soft-spoken, tea-loving mentor Uncle Iroh in Avatar: The Last Airbender, or the booming, chaotic shape-shifting master of darkness Aku in Samurai Jack, his impact on modern animation runs much deeper than two roles. He shaped how animators wrote elderly mentors and villains, injecting humanity into characters that could easily have remained flat caricatures.
Understanding Mako's legacy requires looking past the surface trivia of his most famous parts. His journey reflects the struggles of Asian American actors breaking through Hollywood stereotypes, finding a second wind in the booming animation industry of the late 1990s and 2000s, and leaving a vocal blueprint that successors still study today.
The Foundations of a Trailblazing Career
Long before entering voice booths for children's television, Mako established himself as a theatrical pioneer. In 1965, alongside artists like James Hong, he co-founded East West Players in Los Angeles, the first professional Asian American theatre organization. This move wasn't just about finding work; it was a direct response to Hollywood's systemic practice of casting white actors in yellowface and sidelining Asian talent.
On stage and screen, Mako built a formidable resume. He earned an Academy Award nomination for Best Supporting Actor for his role as Po-han in the 1966 film The Sand Pebbles, and a Tony Award nomination for his work in the Broadway musical Pacific Overtures. These live-action roles demanded immense physical and emotional range, teaching him how to command a room with a whisper rather than a shout. That theatrical discipline translated directly into his voice work, where he didn't rely on cartoonish exaggeration to create memorable figures. Instead, he used cadence, breath, and cultural texture to build entire histories into his vocal performances.
Crafting the Soul of Uncle Iroh
When Avatar: The Last Airbender premiered on Nickelodeon in 2005, the writers needed a character who could serve as both comic relief and a profound moral compass for the exiled prince Zuko. Mako brought Uncle Iroh to life with a gentle, gravelly cadence that immediately communicated safety, sorrow, and wisdom.
Iroh's defining trait wasn't his unmatched mastery of firebending; it was his capacity for empathy. Mako understood how to infuse lines about jasmine tea, board games, and philosophical advice with genuine paternal care. This became devastatingly clear in the season two episode "The Tales of Ba Sing Se". In the segment titled "The Tale of Iroh," the character spends his day helping strangers in the city before buying a small altar, sitting beneath a tree, and weeping for his late son, Lu Ten, who died in the war.
Mako's performance in that brief vignette contains almost no complex exposition. It relies entirely on quiet sobbing, humming a lullaby ("Leaves from the Vine"), and a broken vocal delivery. Tragically, Mako passed away from esophageal cancer on July 21, 2006, shortly after recording his lines for the second season. The production crew dedicated "The Tales of Ba Sing Se" to his memory, cementing the episode as a watershed moment in television history.
Mastering Chaos as Aku
Switching gears entirely, Mako also voiced Aku, the primary antagonist of Genndy Tartakovsky’s Samurai Jack. If Iroh showcased Mako’s capacity for warmth and sorrow, Aku demonstrated his unbridled comedic timing and theatrical malice.
Aku was an ancient, cosmic evil, yet he possessed the petty, dramatic ego of a modern theater villain. Mako's performance relied on a booming, operatic laugh, rapid shifts from terrifying threats to high-pitched whining, and an unmatched delivery of pure theatrical camp. Animators often studied Mako's recording sessions to match Aku's physical expressions to the actor's vocal inflection. Voice actor Greg Baldwin, who eventually stepped in to take over the role for the show's 2017 revival, noted that Mako approached villainy with a sense of joyful abandon, making a monster that viewers loved to hate.
The Succession and Modern Legacy
Mako's passing left a massive void in the voice acting community. Studios faced the daunting task of finding performers who could honor his distinct vocal footprint without resorting to cheap impressions. Greg Baldwin inherited both Uncle Iroh (starting in season three) and Aku (in season five), as well as Master Splinter in the 2007 film TMNT.
Baldwin has frequently shared that he learned Mako's cadence by listening closely to the Pacific Overtures cast recording. When Baldwin stepped into the booth for the final season of Samurai Jack, Mako’s actual daughter and grandson visited the studio. Upon hearing Baldwin speak as Aku, they were moved to tears, noting how closely the performance captured the sonic essence of their patriarch.
Beyond direct replacements, Mako's influence lives on in modern animation writing. Shows across networks now actively seek older, nuanced mentor figures rather than standard exposition-delivery archetypes. The character of Mako in The Legend of Korra was explicitly named in his honor by creators Michael Dante DiMartino and Bryan Konietzko, ensuring his name remains front and center for a new generation of fantasy storytelling fans.
Frequently Asked Questions
Did Mako voice Uncle Iroh for the entire run of Avatar: The Last Airbender?
No. Mako voiced Uncle Iroh through the first two seasons. Following his passing in 2006, voice actor Greg Baldwin took over the role for the third and final season, as well as subsequent video game appearances and The Legend of Korra.
What was Mako's real name?
His birth name was Makoto Iwamatsu, born in Kobe, Japan, in 1933. He adopted the mononym Mako early in his acting career because English speakers frequently struggled to pronounce his full surname.
Was Mako nominated for any major awards?
Yes. He received an Academy Award nomination for Best Supporting Actor for The Sand Pebbles (1966) and a Tony Award nomination for the Broadway musical Pacific Overtures (1976), making him a rare crossover success across stage, film, and television.
How did the creators of Avatar honor Mako after his death?
The production team dedicated the season two emotional centerpiece episode, "The Tales of Ba Sing Se," to his memory. Additionally, the creators named a primary protagonist, Mako, in the sequel series The Legend of Korra as a direct tribute to his legacy.
