Materials that I used:

200 yards of size 6 yarn in primary colour (light brown)
80 yards of size 6 yarn in secondary and tertiary colours (red, green, white, dark brown)
30mm safety eyes
4mm hook
Scissors
Recycled yarn stuffing (polyfill will work)
Embroidery thread for detailing if you want additional details.
Darning needle, stitch marker, row counter (or a way to keep count of how many rounds you’ve done)
Your Rudi will be about 50-60cm long depending on tension.

This pattern should work with any chenille, acrylic, cotton, or polyester yarn. However, do note that some adjustments might have to be made, especially when embroidering as well as sewing the legs and arms. Also note that you should use a hook one size smaller than the recommended on your yarn brand. E.g. if the yarn calls for a 7mm hook, use a 6mm instead.