" will be there an update where we can edit a bar style?"

• Fixed HP Bar display bug that got introduced in v1.1.4: now accurately displays up to date health;
• Added bar styles in the config: configurate your custom character, bold, underlined, strikethrough

Just adding ONE of the character is enough! The length is predefined!
Defaults to hearts (see images)

• Added Name reset upon death: if an entity dies and at the moment of death the name was an hp bar: set the name back to the original name before dying.