I have a question, how do you unlock the kooplings.

[EstebanTill2]

So far the only one Ï could unlock was bowsy, how do i get the rest?

 

[Tri-force64]

If you mean Super smash bros 3ds & Wii-u then you don't unlock them exactly. On the character select screen, select Bowser Jr., then tap his icon to Change him to one of the koopalings(just like you would do to change someone's color).

 

[codyplays]

All you have to do is tap his character icon. It's only a costume swap

 

[codyplays]

Skin swap not costume