Let’s talk about Akihito Narihisago — the brilliant yet enigmatic protagonist of the anime Id: Invaded. Also known by his alias “Sakaido” or even referred to as “The Brilliant Detective,” Akihito carries a weighty past that shapes everything he does. Once a police officer, he found himself behind bars after taking justice into his own hands — he killed the man who murdered his daughter. It’s a tragic backstory, no doubt, but it’s also what sets the stage for his extraordinary journey.

Now here’s where things get interesting: despite being imprisoned, Akihito possesses a rare and almost supernatural ability — he can dive deep into the subconscious minds of murderers, navigating their twisted inner worlds to uncover hidden truths. This skill didn’t go unnoticed. In fact, it caught the attention of a covert government agency called the “Kura,” which quickly recruited him. So, from prisoner to operative — quite the turnaround, right?

As a Kura agent, Akihito’s main role is to enter what they call “id wells” — surreal, dreamlike realms built from the psyche of serial killers. These aren’t just random nightmares; each id well holds clues to real-world crimes. By piecing together symbolic fragments and solving intricate puzzles within these psychological labyrinths, Akihito helps prevent future murders. His own id well becomes a central hub throughout the series, reflecting not only the killer’s mind but also elements of his own fractured psyche.

What makes Akihito stand out isn’t just his sharp intellect — though that’s definitely a big part of it — but how he evolves over time. The more cases he solves, the deeper he dives into the minds of killers, and slowly, he begins to understand them on a level most wouldn’t dare approach. He starts showing empathy, not for their actions, but for the broken psychology behind them. That said, this growing connection comes with risks. Some of these killers are dangerously unstable, and diving too deep could cost him his sanity — or worse.

Still, Akihito never backs down. His commitment to justice remains rock-solid, even when the line between hunter and hunted blurs. Whether it’s bringing closure to grieving families or stopping another tragedy before it happens, Akihito pushes forward with quiet determination. And honestly, that’s one of the most compelling parts of his character — he’s not flashy or loud, but his resolve? Unshakable.

Looking at personality types, Akihito fits the INTP mold pretty perfectly. If you’re familiar with Myers-Briggs, you’ll know INTPs are the thinkers — analytical, independent, always chasing knowledge. Akihito embodies that. He approaches every case like a complex equation, breaking it down logically, often ignoring protocol if it means getting closer to the truth. He doesn’t play well with authority, prefers working solo, and yeah, he might come off as distant or cold. But that’s not because he doesn’t care — it’s because emotions aren’t his primary language. Logic is.

And then there’s the Enneagram angle. Akihito reads strongly as a Type 5 — the Investigator. This type is driven by a fear of helplessness, so they compensate by gathering knowledge, mastering systems, and maintaining control through understanding. Sound familiar? Absolutely. Akihito’s entire modus operandi revolves around knowing more, seeing deeper, staying one step ahead. He withdraws emotionally not out of indifference, but as a way to preserve mental clarity. He needs space, silence, and independence to function at his best.

But let’s be real — this strength has its downsides. His detachment can border on isolation. He struggles with emotional intimacy, often appearing aloof or unapproachable. There are moments when his over-analysis slows him down, getting lost in details while the bigger picture slips away. These aren’t flaws in the traditional sense, but rather natural pitfalls of his personality structure.

All in all, Akihito Narihisago is a fascinating blend of brilliance and burden. As Sakaido, the detective who walks through the minds of killers, he walks a razor-thin line between insight and obsession. Yet through it all, his core mission stays clear: solve the unsolvable, give voice to the victims, and find meaning in a world filled with darkness. Akihito Narihisago may not wear a cape, but in the world of Id: Invaded, he’s definitely a hero shaped by pain, powered by intellect, and defined by purpose. Akihito Narihisago, without a doubt, leaves a lasting impression.