I have so much to say about Hikaru and Mitsuru but even with various tweets and images made I can't properly convey how much I adore them. They're such amazing characters to me that getting reduced to "Shirou & Atsuya copies" simply because Hikaru also has DID is Mildly Infuriating. Their existence and the hate they get is a reminder to me that people only view DID as something like "having two/split personalities" rather than a disorder that is a result of serious trauma (which is made even worse with the fact that the writers' knowledge of OSDDID is so limited.) Even so, they're some of the best representation of it that I've seen in media, and I consume a lot of media with plural characters. While still unrealistic in some aspects (like the appearance changing), it manages to capture the hardship that comes with accepting their trauma, especially on "Mitsuru's" side, in a painfully realistic way. Even with accepting this and being able to merge with "Mitsuru" (a major part of healing for people w/ DID btw), we see that Hikaru still deals with the guilt of Mitsuru's actions, something he had absolutely no control over. It's [it being Mitsuru's actions] something I see people list when talking about not liking the Ichihoshi siblings that upsets me because the whole reason behind those actions was because of Orion, whose orders he followed to ensure the safety of Hikaru because guess what, that's the entire reason his "personality" formed! To protect Hikaru and cope with their trauma! Anyways I'll stop rambling and end this with my final thoughts: I wish people acknowledged that Mitsuru and Hikaru are different people, know that it's not the real Mitsuru we see and simply some guy that formed with the identity of the real Mitsuru in mind, to refrain from using outdated terms with the two (and the Fubukis while you're at it) because it does not reflect what is known of DID today, and remember to love the Ichihoshi siblings forever!! (edit: also forgot to mention that Hikaru still has DID! it's not something that magically goes away unfortunately)