Hatterene with sunglasses.
To upload and use Discord Stickers you need to have Discord Nitro and a server with at least 1 boost level. To upload and use the Hatterene is cool. Sticker you need to go to the "server settings" page, under the tab called "stickers" you should see an option to upload a sticker. You should click the round plus button then select the image you just downloaded from this website.