Forest King

The Forest King (森林王, Shinrin-ō) was a mysterious being who ruled over the Forest Tribe and wanted to return the lost greenery to Earth at the cost of the humans inhabiting it. He was killed by Genos.

Appearance
The Forest King was a large and monstrous-looking tree creature, standing several stories high and had what appeared to be another face in his abdomen and several thick branches covering his body that acted as his limbs. His own face sported five pitch-black eyes and a mouth full of hole-like openings.

Personality
The Forest King saw humans as nothing more than mere fertilizer that his kind needed in order to carry on his scheme of returning the lost greenery to Earth.

Neo Heroes Introduction Arc
After four heroes of the Hero Association fought and harmed his followers, the Forest King himself confronts the heroes and easily defeats and captures them. As he is about to feed them as fertilizer to his kind, another hero appears, annihilates his entire army, and then proceeds to defeat the Forest King himself.

Abilities and Powers
The Forest King could single-handedly defeat four professional heroes of the Hero Association with little to no effort, with the heroes being impotent against him.

Physical Abilities
Immense Strength: The Forest King could use his branches to easily crush anything in his grasp with great force.

Immense Durability: The Forest King could endure the attacks of an A-Class hero without sustaining any damage.

Trivia

 * The Forest King is the ninth of many "Kings" mentioned in the series, the others being the Subterranean King, the Beast King, the Deep Sea King, the Ancient King, the Underworld King (anime-only), the Sky King, the "second Sea King", and the Monster King.
 * Along with the Sky King, Ancient King and Orochi, he is the only king not killed by Saitama.