Yu Yu Hakusho

Yusuke Urameshi, dying in a car accident while saving a child and being resurrected to work as a Spirit Detective. His initial missions involve recovering stolen artifacts from demons, which leads to him meeting and later teaming up with some of his antagonists, including the delinquent Kazuma Kuwabara, the plant-manipulating Kurama, and the fire-wielding Hiei. The season concludes with the Spirit Detective team defeating the "Saint Beasts," a group of demons causing chaos in the human world.

Yusuke and his friends as they are forced to enter a deadly demon martial arts tournament. The season is defined by its lengthy and intense battles, featuring the core team against various supernatural fighters, culminating in the final match against the formidable Team Toguro. Key moments include Genkai's transformation and later death, Hiei unleashing the "Dragon of the Darkness Flame," and Yusuke's ultimate confrontation with Toguro.

Yusuke Urameshi and his friends confronting a powerful former Spirit Detective named Shinobu Sensui. Sensui seeks to open a destructive gateway between the Human and Demon Worlds, prompting Yusuke and his team to battle Sensui and his seven allies, who possess unique and dangerous powers. This arc delves into the darker history of human and demon interactions and forces Yusuke to awaken his full demon heritage to stand a chance against his formidable new enemy.

The power struggle in the Demon World as the three legendary kings—Raizen, Mukuro, and Yomi—vie for dominance. The season involves Yusuke, Hiei, and Kurama being summoned to the Demon World to train under these kings, which ultimately leads to a massive tournament orchestrated by Yusuke to prevent all-out war. The saga concludes with the tournament's resolution, a new king being crowned, and the series ending with a time jump showing the characters two years later in the human world.