There are 12 characters to choose from in Super Mario Bros. Wonder, making it one of the largest casts for a Mario game. You can expect the typical selection of Mario characters and some new faces and color variants.
All Super Mario Bros Wonder Playable Characters
Here are all the characters you can play in Super Mario Bros. Wonder.
Related: All Badges in Super Mario Wonder
What character should I pick in Super Mario Bros Wonder?
Ultimately, the choice is up to you. You can complete the game as any character, but there are some key differences between the cast of Super Mario Bros. Wonder. Most characters have different jump distances and heights, while some have special abilities, like Peach's float and Yoshi's hover.
Another distinction is not every character can use all Power-Ups. Yoshi and Nabbit cannot transform with Power-Ups, but to offset this, they cannot take damage. We don't know the ins and outs of all characters now, so there may be more Power-Ups some characters cannot use.
Are there Secret Characters in Super Mario Bros Wonder?
Unfortunately, there is no answer to whether you can unlock secret characters in Super Mario Bros. Wonder. Super Mario 3D World allowed you to unlock Rosalina and expand your character roster, but it is still being determined whether Super Mario Bros. Wonder will let you do the same. The character roster is already large for a Mario game, so this may be all characters available to play as.