Eagle Vision: the signature ability of Assassin's Creed. Ritsuka will get a weakened version of Edward's particular brand, where she'll be able to "see" the world around her in grey, with various important people marked out as either blue (ally/friend) or red (hostile). a quick note that it only shows what they're feeling towards her at that moment, so a villainous character can easily slip past her guard if they're not hostile towards Ritsuka specifically.