Mario - the titular character and main protagonist of the game.
Luigi - Mario's younger brother who often joins him on his adventures.
Princess Toadstool (later known as Princess Peach) - the princess of the Mushroom Kingdom who is often kidnapped by Bowser.
Bowser - the main antagonist of the game and leader of the Koopa Troop.
Goombas - a common enemy in the game.
Koopa Troopas - another common enemy in the game.
Yoshi - a friendly dinosaur who first appears in Super Mario World.
These are just a few of the many characters that appear in the Super Mario Bros universe.
Each character has their own unique abilities and personalities, making the game a beloved classic for gamers of all ages.