The DSi (XL) was the first handheld I ever owned!!! I got it for Christmas a little over a decade ago, near the end of its lifespan at that point, but I loved it endlessly. I was still pretty small back then, so having a gaming system that wasn't a parentally-controlled old MacBook or the family Wii was super exciting. I'm not including a gallery for my games because there's way too many and they're probably scattered around the house, but some of my favorites were The Legend of Zelda: Spirit Tracks (of course), Hot Wheels Track Attack, Pokemon Black Version, Pokemon Mystery Dungeon, and MySims.
The Flipnote Studio software was also a huge part of my childhood! I made tons of shitty little animations, mostly nightcore music videos of myself and weird slideshows.

These stickers are not the same ones that decorated the console when I was a kid. I replaced them around middle school, but there was a time when i had construction paper cutouts and Star Wars stickers plastered on the front.