Introducing BoneRNG - Rnadomize Bones Pose Blender addon

Inject spontaneity into your character and particle animations by effortlessly randomizing the rotation, location, and scale of bones. With a single click, witness your characters take on dynamic, unexpected poses that breathe life into your projects.

automatically insert keyframes to the new transformations, to make it easy to modify your animations

Create Perfectly Looping Animations, Break free from predictable motion loops and unlock endless creative possibilities. BoneRNG allows you to generate endlessly varied animations

Customizable Parameters, Tailor the degree of randomness to match your creative vision. Choose to add to the current transform or replace it with a new random transform. Fine-tune the noise scale for rotation, location, and scale to achieve the perfect balance.

The addon works in object mode on the selected armature, you can access its powerful features directly from the N panel

Made for blender version 4.0, 4.1, and 4.2

...So you can make some particle animations using this addon... but how could you parent particle objects automatically to the armature? check this out, it might help

https://blendermarket.com/products/autorigparticles