like i said earlier swap chara was the first to die and turned into a bunny, and i said earlier that blue and swap chara had the same rabbit blood sample, so swap chara called blue 'big bro' or 'brother', and blue let her call him that, because he cant say no to when swap chara is adorable, so yeah blue let it be, if swap chara was angry, she would turn into a giant monster with only a head, but gigantic, and has ears as arms.

This is swap charas monster form.