Some ideas about the twins - how they see each other.
I don't have any experience writing headcanons, but I felt inspired and a bit hyper-focused on them; plus, no one else around here is writing for them, so why not write them myself? Everyone improves with time, and I had mentioned in a comment a while back that if I ever found inspiration, I’d write one, even if it turned out to be the most generic headcanon of all. If anyone wants to contribute ideas for them, feel free to send them to me.
Note: English is not my first language; if there are any errors or oddities, blame Google Translate.
At the start of the fight with Niko, he says, “You took my blood… now I’ll take yours slowly.” I began interpreting that line both literally and abstractly in order to develop their relationship.
James not only wounded him but killed his brother, flesh of his flesh, severing the deep bond between brothers.
Based on this, I think they see themselves not only as brothers but also as one.
Extensions of one another, functioning in perfect harmony, that old cliché about twins feeling each other's pain, the two halves of a whole.
There is no hierarchy between the two. Leader and follower, older and younger, stronger and weaker, protector and protected. NO. They are equals, complete.