OK, I've got a group of characters who, before birth, were possessed by magic-eating spirits. Each kid has essentially mentally fused, so it's hard to say whether they're more the child or the spirit being. I've written some stuff from the perspectives of several kids like this, and it only gets tricky on the rare occasions that they separate briefly. But now I'm working on a story from the first person perspective(s) of a set of twins who were possessed by a single spirit, which only split into two when it was forced to do so by the children being born (and therefore not always side by side). Even after that, they have a strong mental link, to the point where they aren't entirely certain if they're one person or two. Very often they will simultaneously think the exact same thought, and they can feel each other's feelings and see through each other's eyes and such. And they're both the perspective character, together. (Incidentally, they're actually same-sex fraternal twins, simply because there aren't enough of those in fiction.) In the intro bit I've written, I've narrated everything with 'we', but when I have to refer to one twin specifically (eg, saying which one did a particular action) how do I make the unique perspective clear? If I just use the twin's name it sounds like third person, but I could see it getting very confusing if two different characters were both called 'I'. Should I have 'I (Tom)' and 'I (Joe)' or would the parentheses get annoying? Or can I get away with them using third person to refer to one twin specifically?