Introducing them to what?
If you want to introduce them to Glocks, get the Glock.
If you want to introduce them to 22 pistols, get a Mark IV.
If you want to introduce them to fine pistols, get a S&W Model 41.
That said, there are some revolvers and guns not chambered in 22 that are good for introductions.
If you want to introduce someone to shooting, consider a 3-screw Single Six.
If you want to introduce them to double-action revolvers, get a S&W Masterpiece.
If you want to introduce them to target shooting, consider an air pistol.
If you want to introduce them to handgun combat, consider an airsoft pistol.