N4T

Image 1: Sniffing Kami's neck

[Warning: If you don't agree with anything I say here, you can just click off]

Right off the bat, you can see that their hair resembles the hairstyle that's classified as 'emo'

And even if he doesn't wear all the makeup or dress emo, is because he's a prosecutor, and in most jobs, they have dress codes, or he just doesn't have the time in his schedule to do that stuff.

Some outfits he wears when he's not working

Usually dark colored outfits.

When he was a kid, he only lived with his mom, so they probably didn't have the money for any cool outfits, and in his school, judging from this, they all had school uniforms

And being emo, of course, isn't just how you dress, but of course, how you act as well, being dramatic, etc.

Technically he only does this in the anime, but in the manga it's still pretty dramatic

And also how he reacted to losing his faith in Kira and getting caught