By "ununderstandable" I mean that this character I'm thinking of isn't human. He's more of a devil sort of thing. Of course he still has his motivations, goals, etc, but he's more of a tool rather than a force in the story. He just wants his thing and has basically no emotions or humanity. He doesn't care about the main character or what happens to him, be it good or bad.
He's like the bus in that Sandra Bullock movie hah
Right now I'm in the planning stage. My question is 'Should the conflict include this "tool-character" and be something like "devil against man", or should I consider the conflict to be "the internal struggles of the actual character, which are caused by the tool-character's actions" ?'
Note: I'm fairly new to all this, so I try to grab on to concepts like conflict and theme to better understand how to write