I’ve been wanting to sketch this for a while now lol This is like, the triplets in “Pikamena mode”
 
Their mane kinda “deflates” a bit like Pinkie’s and lookst a bit more straight than usual, their coats also dull up and they all turn into a specific mindset.
 
Chocolate Cake gets depressed, she barelly feels like moving or doing anything, she will literally stay put and lay on the floor, mumbling random stuff about how life is pointless and why bother.
 
Strawberry Tart gets angry and agressive, she will look angry all the time and practically growl. She can be quite agressive with insults too so I wouldn’t really approach for conversation if I were u. She knows how to hit weak spots lol.
 
Chocolate and Strawberry kinda stick together usually so you will most likely see Berry growling some words and complains while dragging Chocolate around by her tail.
 
And Vanilla kind of goes nuts, closest to Pinkamena. She’s very organized and rational so I imagine she would talk to kitchen gadgets and idk, mess up recipes (like putting the whole egg, with shells on it, and mistaking idk, oil for vinegar)
 
Chocolate and Strawberry get that either when they’re sort of delusional (like when something bad happens or something goes really wrong) or either when their bloodsugar is really low. Vanilla gets like that specially when things don’t go as planned (she might have some mild OCD going on).