for checkered mimicry, put "A and B squares body skin texture". A stands for color #1 and B stands for color #2, like "black and white squares body skin texture", "blue and white squares body skin texture"etc. mimicry may not wotk on realistic models, 2d, 2.5d, 3d - should work

for melting, use melting [ANY BODY PART], like "melting legs", "melting hair", "melting body" etc

for changing appearance, try use "1girl, solo, [CHARACTER A], [CHARACTER B], multicolored hair, shapeshifting clothes, melting clothes, liquid metal impersonation"