Sites like Loose Leaf (historically popular, may require translation) or community-made creators on RPG Maker Web allow you to mix and match parts to export a sprite sheet. 2. Importing Your Characters

A true character creator isn't just for the overworld. RMXP uses (8-faces per sheet) for dialogue and Battlers for side-view combat (if you use a custom SDK).

If you do not want to code Ruby yourself, the XP community has already built full character creator systems.