When going to an audition, is it important to find the essence of the character before going into the audition room?

It is important to go in the door with the essence of the character, but it is also important to go in with the essence of who you are. If the character is a villain, some people don't know how to draw that line. if you are a seasoned actor and understand that you find the nice or interesting side of even a villain because you need something from everyone in the room, then you will be fine.