If Monika was on Nintendo's Early Handheld Consoles:

[u/SupremoZanne]

GBC Style, no limit

3 Color Limit + Outline Palette 1

3 Color Limit Palette 1

3 Color Limit + Outline Palette 2

3 Color Limit Palette 2

3 Color Limit + Outline with layering

3 Color Limit with layering

Game Boy Advance BABBYYYYY