I colored the original model in Bambu Studio. I was using the filament as below:

(Slot 1) Red - Anycubic PLA (default Generic PLA Profile)
(Slot 2) White - Bambu PLA Basic (default Bambu PLA Basic Profile)

(Slot 3) Black - Bambu PLA Matte (default Bambu PLA Matte Profile)

(Slot 4) Pink - Bambu PLA Matte (default Bambu PLA Matte Profile)

(Slot 5) Blue - Anycubic PLA (default Generic PLA Profile)

I painted the support area of the hat to ignore supports that near the forehead of Kirby as it is quite hard to remove the supports if using the default settings.

As I only got 1 AMS, I added a layer pause after printing the blue color in the eyes. Then I changed my slot 2 filament to Bambu PLA Basic White and continued the print. If you have more than 1 AMS, you don't need the layer pause and may consider using Bambu Support for PLA as the support interface filament.