There is something very special in my life

It's not a boy (ok well I have a darling boy but he got his own post here)
It's not alive. (Although sometimes I think Pocahontas may beg to differ)
Its colorful.
It goes lots of places with us.
It belongs to Kenz.
Its name is Sami Plankton.

Who can guess what it is?

I will give a special treat to anyone who figures it out. (Pocahontas and Kenz cannot play.)

Good Luck!