Jirou “Dillo” is a character you might not expect to leave a lasting impression, but despite being a minor presence in Mushoku Tensei: Jobless Reincarnation (also known as Mushoku Tensei: Isekai Ittara Honki Dasu), he actually plays a surprisingly meaningful role. At first glance, Dillo comes across as grumpy and a bit argumentative—someone who’s quick to point out rules and isn’t afraid to scold others. But as the story unfolds, it becomes clear that there’s much more beneath the surface. Jirou “Dillo” may seem tough on the outside, but deep down, he has a genuinely kind heart.

Now, let’s talk about what makes Jirou “Dillo” stand out. Even though he’s retired from his days as an adventurer, he hasn’t stopped guiding others. In fact, he takes on a mentor-like role for Rudeus Greyrat, the main protagonist of the series. For someone who could’ve just settled into a quiet life as a gatekeeper in Millis, Dillo goes the extra mile. He sees potential in Rudeus early on—something not everyone does—and actively helps him grow. Whether it’s offering advice, sharing hard-earned wisdom from his own past, or simply being a steady presence, Jirou “Dillo” steps up as something of a father figure.

And honestly, that makes sense when you consider his backstory. While the anime doesn’t dive too deeply into Jirou “Dillo”’s past, there are strong hints that he’s endured significant loss. It’s implied that his recklessness during his adventuring days cost him his family and friends—a tragedy that clearly shaped who he is today. That painful history explains why he’s so cautious now, why he values safety, and why he emphasizes discipline and responsibility. Yet, despite carrying that emotional weight, Jirou “Dillo” doesn’t let it break him. Instead, he channels it into helping others avoid similar mistakes.

So, while Jirou “Dillo” might not be front and center in every episode, his impact is undeniable. He represents resilience, quiet strength, and the kind of guidance that can shape a young person’s future. His lessons aren’t flashy, but they’re grounded and real—just like Jirou “Dillo” himself.

When we look at his personality more closely, it’s pretty clear that Jirou “Dillo” fits the ISTJ type—Introverted, Sensing, Thinking, Judging. He’s not one for big social gatherings; he prefers working quietly on his own, observing carefully, and sticking to what he knows works. Jirou “Dillo” is all about facts, details, and practical solutions. He doesn’t get caught up in abstract theories or wild ideas. Instead, he focuses on what’s real, what’s proven, and what gets results.

You’ll also notice that Jirou “Dillo” has a strong respect for rules and structure. He’s not the type to bend procedures unless there’s a solid reason. That’s classic ISTJ behavior—reliable, responsible, and always thinking ahead. He plans things out, stays organized, and holds himself accountable. And when he speaks, he’s direct and logical. Emotions don’t cloud his judgment. Jirou “Dillo” calls it like he sees it, even if it comes off as blunt.

Then there’s the Enneagram angle. Based on his actions and mindset throughout Mushoku Tensei, Jirou “Dillo” most likely falls under Type 6—the Loyalist. This makes a lot of sense. He’s deeply committed to duty, loyal to his responsibilities, and always ready to support those he trusts. He follows protocols not just because he has to, but because he believes in them. Jirou “Dillo” wants stability, security, and predictability—things that help him feel in control after past trauma.

At the same time, his fear of abandonment and distrust of unfamiliar situations are telltale signs of a Type 6. He’s wary of change, hesitant to take risks, and sometimes overly defensive. These traits stem from his desire to protect himself and others from harm. While this loyalty and caution serve him well, they can also hold him back from fully opening up or embracing new opportunities.

In the end, Jirou “Dillo” is far more than just a side character with a stern expression. He’s a man shaped by loss, guided by principle, and driven by a quiet sense of care for those around him. Whether it’s through his mentorship of Rudeus or his steadfast adherence to his values, Jirou “Dillo” leaves a mark. And even though he may never seek recognition, characters like Jirou “Dillo” remind us how important it is to have someone steady in the background—someone who’s been through the fire and still chooses to do the right thing.