DragonMine Z: Character Slots

Each character has separate inventory, armor, Ender Chest, position, dimension and spawn point, along with its own race, class, level, transformations, skills, cooldowns, stats, quests and advancements. Switching between characters works like logging into another account without leaving the server, and progress stays isolated under the same player.

The mod is built around protecting progress: each character keeps independent save data, file writes are atomic to reduce the risk of corruption, backups are made automatically, and duplicated character data is guarded against. Commands under dmzchar manage the slots. Teams, parties and compatible addon data are supported, which suits players who want one Minecraft installation for several playstyles such as Saiyan PvP, Namekian tanking or Frost Demon farming.

The mod is published for Forge only, for 1.20.1, with 0.9.0 as the latest file in the beta channel. It is client required and server optional, and it is released under the GNU General Public License v3.0 only, so it is not open source. The author states that new features are planned.