The Killer Bunny isn't available in the Bedrock version of Minecraft ... many different animals and creatures in Minecraft.

To summon this mob, players need to write /summon minecraft:illusioner in the command box. Killer bunny is an unused variant of rabbit (Image ... This is an invisible, Bedrock-exclusive mob ...

the Killer Bunny was a hostile mob that was introduced to Minecraft: Java Edition but ultimately left unused. This rabbit attacks players and wolves, dealing a surprising eight damage per strike ...