KOENMA SPOILER!

Koenma
KO

Yu Yu Hakusho · Major Supporting / Acting Ruler of Spirit World

The son of King Enma appears to Yusuke as a toddler with a pacifier, which makes it easy to underestimate the person assigning life-and-death missions. Koenma is the acting administrator of Spirit World whenever his father is away and carries far more responsibility than his appearance suggests. He recruits Yusuke as a Spirit Detective, manages the supernatural crises around him and frequently has to balance official Spirit World policy against what he knows is actually right. His pacifier stores enormous spiritual energy over time, eventually becoming central to the confrontation with Sensui. Koenma can transform into an older form, but the absurd toddler body remains his most familiar face. His friendship with Yusuke gradually becomes strong enough that he is willing to challenge Spirit World's own decisions rather than simply enforce them.
10 CONNECTED LORE ENTRIES

KOENMA THROUGH THE ARCHIVE //

THREE KINGS & DEMON WORLD GUIDE //

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Spirit World Decides Yusuke Is Now the Threat

SPOILER! Open →
Yusuke's Mazoku awakening saves him from death, but it also moves him into the category Spirit World's barrier system was built to fear. Koenma is ordered to have Yusuke erased and refuses, putting himself at odds with the institution he has spent the series representing.

The irony is deliberate. Yusuke became Spirit Detective because Spirit World needed a human to deal with demons. Once his ancestry makes that boundary inconvenient, the same system starts treating him as a problem to remove.
What changed
Yusuke's conflict with Spirit World stops being teenage irritation at bureaucracy. The bureaucracy is now willing to kill him.

Debut: Ep 095 - Yusuke's Destiny