So I made a thing in Tumblr here (To those who are in Tumblr, you might already saw this), and I'll show you how I determined their stats.
Okay, so for you to judge how evil they would be, you have to answer some guide questions:
What is your plant villain's true motive?Do they (purposely and actively) hurt anyone? List down the ones that they would most likely to attack (plant, zombie, human).Do they still believe in morals? Identify these morals (playing fair, believing in justice, etc.).In unfolding their master plan, how large would the affected area be? What special ability/ies do they have? Is it deadly?Do they still have a grip on their sanity? For how long?What are the things that they want the most (fame, seclusion, food, etc.)?What are the thing/s (may it be a thing, a trait, or someone) that holds them back in becoming truly evil?
After answering th