How about a tameable Red Phantom like Minecraft Dungeons? New pet that helps you fight while flying or while high up in the air, to fill in the missing companion (since we have dogs for land, axolotl for water, Red Phantoms for air)

New quests or storylines: Create additional quests, storylines, or side quests that expand the game narrative. Customizable characters: Allow players to modify their character appearance, abilities, or skills beyond the default options. New items and equipment: Introduce unique weapons, armor, or magical items that provide new gameplay opportunities. Faction expansions: Add new playable factions with their unique units, buildings, and abilities. Map editor: Develop a tool that enables players to create their custom maps and scenarios. Diplomacy enhancements: Improve the game& diplomacy mechanics by adding new negotiation options, alliances, or trade systems. prepaidgiftbalance.com

Would be nice to see some natural disaster mod I think (not weather-related, but containing earthquakes and stuff like that, as there already is 1 climate disasters mod, but no mods adding non-climatic disasters to the game)