Name: The demon of apathy
Power: When you begin something, she waits for that moment when your initial drive starts to falter, and you realise the scale of your task, and how much work it's going to take to complete. That's when she leans over your shoulder, and whispers in your ear: "My, that looks tiring. Let's be honest, now - how much do you really care? Will it make that much of a difference whether you do it or not? It's fine if you forget about it, you know. Nobody would blame you. Wouldn't it be easier to simply... Let it be?"
Nemesis: The angel of perseverance
Example: The innumerable posts on the Escapist that I've began to write, and then thought, "Eh, whatever, it doesn't really matter." And closed the tab, and moved on...