I love writing every one of my boys, but i'd be lying if I didn't say Azreth wasn't the best to write.
His narration is waaaaaaaaay more casual than anyone else's, he is the most extroverted out of the main trio, and his style is easier for me to pull off, and as a bonus I can just write anything that comes to mind when writing him and it never really feels out of character... He is totally the sort of self-absorbed himbo who would say some dumb shit right in the middle of combat or a serious situation, and I just love that. xD
I could mention how different he is from the other characters as also a bonus,
Him and Vernon are polar opposites, while Grey has common ground with both of them.
Vernon is the hero, kind, gentle, selfless, loving, often depressed, and a big martyr, he is wholesome and cute most of the time, and you just want to hug him and tell him everything will be alright.
Grey is more in between, he knows when to play nice and when to play rough, he is often very sarcastic and confident without being cocky, and he is a badass.
And then there is Azreth... Very expressive, all the colors of the emotional spectrun showing up in one chapter, 90% of the time he is selfish and arrogant, and even dowright manipulative, he also often goes in over his head when he feels challenged and gets himself into stupid messes... He can tottally kick ass, but if you spend a day watching him doing his regular stuff you begin to question wether the stories of his prowesses are really real.
There is a reason he has been a big fan favorite so far, and I do think it's precisely because of these traits. ^^