Congrats. I loved my gamecube. One of my favorite consoles of all time. Here are some classic games that I put a lot of time into on it.
Paper Mario The Thousand Year Door
Mario Kart Double Dash
Super Smash Bro.s Melee
Kirby's Air Ride
Metroid Prime Trilogy
Pikmin 2
Super Monkey Ball
Sonic Adventure 2
Luigi's Mansion
Edit: Also I feel like this would be more suited to the Retro Category no?