Multicolored Seventy-Five is a nickname given to an unnamed transformation of Seventy-Five. It is not one of the main transformations, and has only been seen once during his fight against Soul Weegee and others. It is possibly more powerful than his Ultimate form. He looks like the head part of Gigapad Seventy-Five, except rainbow colored and with red eyes.
Later on, during his fight against Spirit Soul Weegee after the 80 year gap, Seventy-Five transformed into his Gigapad form, with this form briefly flashing on the screen. It seems as though he accessed its power through his Ultimate form in order to reach his Gigapad form.