The kinda red and blue suffer while they are the lucky one. ( btw the red is female and the blue is male. )

Once you defeat the first 2 helpless one's here comes stage 3, they detach from the yellow one and become gender-less somehow ;-;. Showing their true form once you defeat them comes stage 3, final form but it's unknown. The final form is unknown because nobody has ever past the last attack before they change forms on form 2.

Yellow one* not just they -,-

and replace the are with is

stage 2* Not 3 ;-;