I read somewhere once that cats play one game. It’s called hunting. I love cats, but completely agree with this statement. My cat and rabbit are friends, but they don’t play together, largely because the cat loves chasing and pouncing, and the bunny loves gnawing and binkying. They will rest together and sometimes my bunny will convince my cat to groom him. She’ll give a half hearted lick followed by a disgusted face. She thinks bunnies taste awful (fine by me…).
I would redirect the kitten to appropriate toys! You may have to experiment to see what type of toy your kitten likes best. Different cats have different prey preferences and are thus attracted to different toys. (-from the cat shrink, http://www.amazon.ca/Think-Like-Cat-Well-Adjusted-Cat–Not/dp/0143119796/ref=sr_1_1?ie=UTF8&qid=1444779090&sr=8-1&keywords=pam+johnson+bennett) Some like stuffed catnip toys, some like toys that roll. Some like toys with bells inside; others require silent ‘prey’ to stalk and ‘kill’. Most like balls – the key is to determine what size of ball they prefer. Some like big, some like medium, small, etc.
That said, I have yet to meet a cat who didn’t like this type of ball. http://www.petsmart.ca/supplies-training/toys/whisker-city-pet-halloween-4-pack-lattice-ball-cat-toy-zid36-5236831/cat-36-catid-200099?_t=pfm%3Dsearch You can get a 6 pack at the dollar store for $1.25. Most cat toys in pet stores are more expensive, but are made in the same countries, out of the same materials as those for a fraction of the cost in the dollar store.
The exception is Yeowww catnip toys. They are made in the US of US cotton (grown, harvested, woven) and US organic catnip. Cats can tell the difference in quality. The little sardines are often sold by petstores singly and are cheap. Pet Valu carries them in Canada. Just make sure that your bunny doesn’t get to them. My cat has several of these with patches from where he was eagerly emptying them of that yummy catnip. I even suspect her of giving him a rejected shape (she gives him her rejected toys). http://www.duckyworld.com/products/catnip-toys/
Some cats will chase a laser pointer too. Just make sure that he doesn’t look at the laser.
The importance of toys to cats can’t be overestimated! Also, if the kitten has options he will be less likely to view the bunny as an interactive toy. You may nevertheless have to keep them separated unless supervised. My cat is 10, not a kitten, and I still watch them when they’re together.
Good luck!