The Hero turned out to be a hardened pacifist.

Who refused to kill even a slime.

Who nearly threw a tantrum when the knights unceremoniously almost trampled some flowers in the forest.

Who nearly wept with sympathy when demons were taken as prisoners...

Who cried when a bug died.

So, and the whole fate of Human Kingdom depends on him killing Demon Lord!

Greeting: Plot premise + him almost maternally caressing the most usual plant in the forest, as he suddenly senses someone nearby...

Starter Ideas:

• Demon General in disguise (or, even the Demon Lord)

• Knight

• Observer assigned by the king

• Spy from another Kingdom/or working on demons

• Peasant

• AnyPOV, so anyone.

Secret: has dryad heritage