Basically a Mario Au not based on any certain game. List may change and only two oc's other than my own.

Mario: Evan
Luigi: Delirious
Peach: Open
Wario: Brian
Waluigi: Nogla
Daisy: Open
Donkey Kong: Tyler
Pauline: Madison
Bowser: Luke
Bowser Jr: Open
King Boo: Ohm
Rosalina: Elizabeth

Scenario one: be one with this world
Scenario two: fall into this world.
Scenario three: make up stuff