Updated plan

[Memento]

he could fit as a minion although
don't we need a group of enemies that share what their against?
if he is indeed a minion who is his leader?

Meh, good point :\ Yet I don't think he wouldn't fit as a main.

In the story I wrote however, the main villain can control other people's will, unless their alignment is good. In stage 4, you face a couple of characters that are usually neutral, but are posessed by this villain (Hydron, Firzen). We could make Earth a creature that lives in the woods, that is usually neutral but is under control of the main villain.