So you want your character to be a werewolf eh? Thats cool. Who doesn't want razor sharp claws, hair covering their body and their breath smelling like infants? If thats what floats your boat, go for it. Here is the hows on what to do.
First you need to have a day and night system. See my Day and Night guide on how to set it up.
(Note: This werewolf system will only work with my day and night system.)
First create a werewolf hero. The one that your main hero will change into. This includes skills, class, etc. etc.
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Now that you have my day and night system set up you simply need to create two more common events.
Example: Common Event 002: Human
Common Event 003: Wolf
Now, in the day and night system you will notice that there are two switches used to show the difference between night and day: Daylight and Nighttime. You need to add one more event to it, which is to point at the common events for your wolfman (or woman). (There is a common event option on page 1 of the list of actions.) So it will look like this:
[Loop]
Trigger Operation: 002: Daylight is OFF
Common Event: Wolf
Tint screen: -87, -87, -87, transition frames: 40
Trigger Operation: 002: Nighttime is ON
Wait: 999 frames.
Trigger Operation: 002: Daylight is ON
Common Event: Human
Tint Screen: 0, 0, 0, transition frames: 40
Trigger Operation: 002: Nighttime is OFF
[End Loop]
Now your triggers will point to the proper common events.
Now what you do in the Human is this:
Conditional Branch: Switch Daylight is ON:
Flash Screen (255,255,255) at 50 Frames.
Change Party: Remove <HeroWolf>
Change Party: Add <HeroHuman>
Simple eh? Now the wolf event:
Conditional Branch: Switch Nighttime is ON:
Flash Screen (255,255,255) at 50 Frames.
Play Sound Effect: Howl
Change Party: Remove <Hero>
Change Party: Add <Herowolf>
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Boom! Werewolf system done. Now your character will transform into a werewolf whenever the time of day switches.
The flash screen is to make it look cool and the howl is to make it sound cool. Although I think you may need to find a Howl sound online because RMXP doesnt come with one to my knowlage.