There are three groups that in-story have different roles but your choice doesn't affect your experience besides deciding what attacks your character starts with.
Once your avatar is done you need to choose a team. You can't even change the color of your attire, you have to purchase different colors separately.
Fans who like to mish-mash characters together may enjoy this feature, but it's a little hard to stand out from the others when you're dressed similarly to them. You pick up more attire in the shops for in-game currency or win them in missions but they are still just copies of the fighters gear. You're given hairstyles and attire similar to the fighters in the game (with a few exceptions that give you hair styles of characters not included) and you hop into the game. You'll create your avatar using the game's character customization system, which is the bare minimum of character creators.