I used to have a lot. I never counted but... It was at very least a couple hundred things, easily. I decided I was too old for Hello Kitty though, and ended up selling & giving away a lot of it. I still have some in storage that I need to find a home for.
I have a bit of stationary - notebooks, memos, pens, pencils and all that.
A few keyrings, a plush doll and a make up bag.
I have other stuff with Sanrio characters on it.
Probably more hello kitty but can't think right now.