His real name is Nicholas Miller, he's a producer and DJ that produces dubstep and trap music with a strong sentimentality and melody. I first listened to him on YouTube when I was starting to like electronic music years ago. I still listen to his songs to this day and never get sick of them.
EDEN (real name Jonathon Ng) is an Irish singer. When I first listened to him his alias was still "The Eden Project", which was discontinued in 2015, and his music had more of a dubstep style to it. As years passed he went for a pop and indie style, but I never got bored of his songs and still listen to him occasionally.
Alan Walker is a DJ and producer from Norway. I found him first in the NCS channel with his song "Fade", at that time I didn't really listen to his songs that much, but one day he released a sung version of that song called "Faded" and I became his fan since I listened to it. I like the way he mixes electronic with a very melodic style.