The stripe in Kayn's hair doesn't seem to fit with the rest of his design
This stripe is incredibly off-putting -- it not only clashes with the rest of his design but it also skews the general perception of his character.
Kayn in his untransformed state happens to be:
- A character with a small frame
- A character with nothing of interest in his chest area
- A character featuring a glowing red eye (that isn't emphasized enough)
- A character featuring a very large weapon without much variation in color
All of that is actually okay as long as there's good balance of what's on the character itself and it's not over the top.
But then you go and put something on his head that's brighter than everything else. Why? Are you sure you want everyone to look at that? Not only is that hairstyle in horrible taste but it also brings in ALL the negative connotations that come with characters with this type of hair. I'm sure no one wants to recall the horribly done anti-hero character trope where they have an emo stripe in their hair just for a lazy way to make them seem special compared to everyone else.
Honestly, I believe Kayn still needs work. I recommend making the bright stripe in his hair exclusive to his Assassin transformation, as there's no colors for it to clash with. It would help fix how bland that his Assassin transformation is as well, which is something he gravely needs to stay away from looking like a blue version of ordinary Kayn.