Launch the game and create a new character with the exact look you want. Save and exit.

To use the Starbound Change Character Appearance Mod, follow these steps:

: This is widely considered the best "all-in-one" solution. Unlike most workshop mods, it features an in-game character editor that can be accessed by typing /editor open in the chat. It allows for real-time editing of your character's base features.

Solution: This happens when a hairstyle mod is removed but the character retains the hairstyle ID. Reinstall the mod, change to a vanilla hairstyle, then uninstall.