RPKG character builder

Create a character with a definition, opening messages, and an optional portrait. Download it as a single file to import into Museris.

What is an RPKG file?

An .rpkg file is a portable ZIP package for roleplay characters and lorebooks. It keeps character text, alternative greetings, and portrait images together, so you can share a complete character or move it between devices without losing its details.

The contents are plain JSON and images, so you can inspect them with ordinary ZIP tools. This builder exports one character per package.

View the RPKG specification on GitHub ↗

Character details

Name required Tagline optional Character definition required

Describe their personality, history, voice, and the world they live in. This is what the AI uses to play your character.

Opening messages

Opening message required

Write their first message. Set the scene, let them speak, and leave room for the other person to act.

Portrait

optional

Character portrait

PNG, JPEG, or WebP · up to 5 MB. Embedded in your character file.

Portable .rpkg file
Ready to import into Museris