Definitely going with my purple pal Spyro, from the first installment Spyro the Dragon on the Playstation. I still remember the opening jingle, the Insomniac logo, the poor gnorc that gets his patootie kicked off that mountain, Spyro gliding in and making eyebrow jiggles, the "bling" of selecting the menu options, choosing a save file and hearing that jingle, starting in the Artisan home world, freeing the first dragon and realizing how super awesome it was to be talking to this guy, jumping straight off the beginning balcony, running around and collecting gems, watching Sparx grab the ones I missed, charging the gnorcs, flaming the sheep, running through that hedge maze, exploring the nighttime environs of the first level (I skipped Stone Hill, sue me), recognizing that certain enemies were weak to fire or bashing, exploring the underground caves, collecting a key to open a chest that spat out a veritable trove of gems, finding that one ruby that tried to sneak past my attention before I left that cavern, finding the end of the level and discovering I could light the campfires for the heck of it, wondering how on earth I'd be able to take down that humongous gnorc with the club and then realizing I could just sear his soft behind, laughing at the idle animations, going to Stone Hill (finally), chasing the egg thief, jumping down the well, cross-charging the bulls, learning how to do that sick side-roll I never used again, jumping on the rooftops of the small acropolis, gliding out and realizing I could land on a small beach by the waterside, getting 100% on that level and uncovering my true nature as a completionist, entering the Town Square level (okay, I'm not good with names), adoring the change in scenery (from daylight to dusk), frying poor chickens, falling in the water several times before getting that gliding right, taking the time to get those difficult gems, flaming the gem-in-the-boxes, nearly killing myself by charging metal treasure chests, collecting my first one-up dragon trophy, taking on the deceitful Sheep-on-Stilts that was the first boss Toasty (man, I hated those dogs and did I mention I forgot how to roll), taking my first steps in the desert hub world, getting mooned by the enemies, speedrunning Dr. Shemp, skating through the ice level, firing cannons, entering my first-ever flying level (wooooooh), getting at all those nooks and crannies of every level, flying, flaming, butting horns, talking to more and more dragons, fighting gnorcs,
Well, you get the idea. Musta played the game a hundred times.