Mickey.

[Dragonface]

its a bad disguise but dats disney trying to say 'dont worry kids micky mouse hasnt gone evil'

...And SE says "don't ask why kids, Mickey Mouse has gone dumber than he used to be."

hey you cant call micky dumb if there was no micky there would be no disney and thus no kingdom hearts and the world would be taken over by evil candy consuming kids

Thats not what I mean. If Mickey didn't get dumber, he would stay with Sora&co for the whole time and let Riku to do 'Dress up as a Nobody' alone.