Huckleberry is the Sunspider that runs into my bathroom whenever I take a shit at night and tries to hide in the shadow under my feet. She also runs around my desk sometimes. Huckleberry's body and head (not including legs) is about 2cm long, which is about as big they get where I live. The front pair of legs aren't actually legs - they are called "pedipalps" and she holds them up while running around to touch stuff like a little kid doing airplane arms. She zooms around eating dust mites and other small bugs and is very fast. Huckleberry is an arachnid but closer in relation to a scorpion than a spider. She has no venom and spins no web preferring to hunt and explore.
You may also know these fine creatures by other names: Whipscorpion or Camel Spider.
So say hi to Huckleberry, she is nice.
I had a Cross Spider living in my bathroom for a few weeks. It probably didn't find enough food there, so it left in the end. On the day it went, it sat at the ventilation opening for a long time and it was probably due to the wind, but it raised a front leg and looked like it was waving goodbye.