Mario can go through several characters in Super Mario RPG. This tends to work best with characters with set movement paths, but may work with others as well. Two clear examples are in the Mushroom kingdom. If you enter and then exit the home with the string of three kids going to the water spout, and then stand in their path, they will go through you. Also, if you talk to the kid that runs around in circles while she's in her home, she'll run through you if you're in her path. There are probably several examples out there.
Submitted by: Glitched Symbols