For a successful multiplayer implementation, you would need to:
Creating a multiplayer game in RPG Maker is a complex process and usually requires networking knowledge beyond basic game development. It's also important to consider performance, security issues, and the additional work in server maintenance and moderation.
Mostly, developers who want multiplayer functionality tend to choose game engines specifically built with networking in mind, such as Unity or Unreal Engine. Nevertheless, if one wishes to experiment or implement a small-scale multiplayer experience, RPG Maker's scripting capabilities do allow for this kind of advanced customization.