lol that's actually pretty common. People making alt characters just to park somewhere. Some do it to be funny, some do it to run an RMT service. These aren't characters that are used for playing the game.

You can run though some solid objects by running into it for a couple of seconds. In my FC house, I can go to one end of the aquarium and run through it & sit and it completely blocks me from being seen, even my name XD.