Someone who swipes things, like a thief or a person who moves their finger across a touch screen to make something happen.
The word swiper can make people think of stealing or using a touch screen.
Examples:
The swiper took my wallet.
I don't like swipers.
The swiper swiped the screen and the game started.
The swiper tried to take the cookies from the jar.
The swiper swiped all the candy from the store.
The swiper is always taking things that aren't theirs.