Minecraft version: 1.16.5
Modloader: Forge
Forge version: 36.2.4 OR Fabric loader version: x.xx.x
Environment: Tested in singleplayer, but my modpack is intended for both singleplayer and multiplayer play

Mod name: Breedable Killer Rabbit (Forge)
Mod version: 1.5

Does "taming" the Killer Bunny with a golden carrot make it a pet that will follow you and fight for you, or does it simply make it act like a regular bunny, becoming passive towards the player?

It prevents the damage the rabbit does when tamed. It does not add any custom AI though, that's beyond my capabilities currently. So it's just a way to get them into your world, more so as a trophy. Thanks for the interest though!