Mario: Mario is the main character of the series. He is an Italian-American superhero, and was originally referred to as Jumpman in Donkey Kong. In most of the Mario spin-offs, he is the most average character, and is a good choice for starters. He is usually portrayed today with his iconic hat with an M, while also wearing a red shirt and blue overalls. He also has his iconic brown mustache.
Luigi: Luigi is Mario's slightly taller brother. His abilities are usually the same as Mario's, but in some games Luigi can jump higher. Luigi is usually the sidekick, but was the hero in a few games such as Luigi's Mansion. His appearance is similar to Mario's, but instead wears a green shirt and hat with the letter L.
Peach: Princess Peach is the Princess of the Mushroom Kingdom. Mario often saves her from Bowser in many of the Mario games. However, she may sometimes be the protagonist in the game, such as Super Princess Peach and Super Mario 3D World. She is shown wearing a pink dress and a crown on her head of yellow hair.
Daisy: Daisy is the Princess of Sarasaland. The first game that she was in was Super Mario Land. She dresses similarly as Peach, she is shown instead with an orange dress and brown hair.
Yoshi: Yoshi is a dinosaur that Mario rides in some games. He appeared in his own game, Yoshi's Island.
Toad: Toad is a mushroom-shaped creature who appears in many Mario series games. He is just one of many toads. These creatures first appeared in Super Mario Bros., where they were called Mushroom Retainers.
Goombario: a goomba who sides with mario in paper mario
Kooper: a koopa siding with mario in paper mario
Bombette: a female bobomb who helps mario in paper mario
Watt: a spark that shines mario's path in paper mario
Lady bow: a boo that scares and slaps her way to victory alongside mario in paper mario