Knives for kids if your kids are old enough to use a real knife. 
Banana slicer for cutting the bananas if your child isn't quite ready to take on a knife.
Once your child is ready to take on knives, these cut resistant gloves are a must have!

Avocado slicer.

I like this apple slicer because the handles are big and it has a base to set the apple on to prevent slipping. It also cuts 16 slices
This is the greatest invention ever for cutting pineapples and it is so easy to use!

We had a juicer like this growing up and my parents still have the same one.  My kids love using it and the juice taste so much better than store bought!
How cute are these human-shaped kitchen utensils?!?!

Riki's Kingdom Kids Cooking and Baking Utensil Set

Curious Chef's Kids Cookware

Ninja Nutri Pro Compact Personal Blender, with 18 Oz. and 24 Oz. To Go Cups 

Tovla Jr. Kids Cooking and Baking Set

Silicone Muffin Pan