Hi there!

Just a quick question since my search on runners didn't net much. What is the point of runners? What do they do that's special? I keep seeing how much people love them but I don't know why yet. Also, I have a villager who is randomly "running away" but she doesn't seem to be running from anything and it usually happens when I set her to a specific task (ex. fishing) but it also happens other times with no apparent reason. Is she a runner perhaps? Can I put her desire to run to some use?
Thanks