Super Smash Bros. Ultimate is a massive crossover fighting game, featuring an enormous roster of over 70 fighters. However, when you first start the game you’re limited to the eight fighters who appeared on the original Super Smash Bros. on the Nintendo 64.
You’ll unlock more fighters just through playing, but it’s not as random as you think. There are multiple ways to unlock characters, and by adventuring through the World of Light single player mode or completing Classic Mode with certain fighters, you can be a bit more proactive and hunt for certain characters.