Anyways the obvious answer is the koopalings, because the koopalings are better then all of them. Bowser jr. can be considdered second to first.
So basically
1:Koopalings
2:Bowser jr
3:Baby Bowser
4:Anything koopa kid.
So basically
1:Koopalings
2:Bowser jr
3:Baby Bowser
4:Anything koopa kid.