(I'm gonna be really biased with this character, just a heads-up)

Byron is a stern man who spends most of his time in his study. He rarely shows emotions and finds it hard to read the princess's emotions because they change constantly, although he comes to enjoy studying her for this very reason.

Rumours of his restrained nature strike a curious contrast with his popularity among the common-folks as a leader of profound character.

Byron is, outwardly, quite emotionless and extremely well-composed due to his upbringing. He’s able to keep his cool in most situations and very rarely displays much emotion to others, especially when away from Stein Castle. Inside known territory, he becomes more relaxed and will smile every now and again, although this again is rare and only happens more when he’s entertained by something or with the Princess Elect; Albert himself said that Byron has been taciturn from childhood, and Robert noted his emotionless tendencies even when he was very young and being escorted inside Stein Castle by the bureaucrats.

Because of his seemingly quite strictly monitored childhood and the way he was brought up (to have abilities such as controlling people’s emotions, which he tells the Princess Elect about), Byron struggles with emotion, certainly very much so at the start of his route. Over time, he seems to quickly develop said emotions and learn to understand them better, although in all routes he shows compassion and a very fair sense of judgement.

He is also extremely loyal to and cares very much about Stein and his people; other than in the latter half of his route, he doesn’t separate himself from his country and doesn’t distinguish his needs from that of Stein. While he does what he can to maintain peaceful resolutions to problems, most likely due to his father’s past, he has shown himself to be capable of killing or allowing a war to start should it be necessary and should no alternative option be available.

When he becomes more comfortable around the Princess Elect and is with her, he shows a much more playful side of him that’s not seen anywhere else, and he can be quite mischievous, teasing and light-hearted when in this frame of mind. Along with this, he seems to become more relaxed and less serious when he takes his eye-patch off, most likely due to an association of duty he has made with it.

(Bottom Line: Regal and lowkey flirtatious king.)