I first became interested in style when I was 16 and I had my first couple of gigs. I realised I couldn't look like the people I was performing to. Not in a condescending way, but just that it would be weird if I was wearing exactly what someone in the crowd was wearing.
Grime is a particular style of music. You've got electro, funk and garage; grime is its darker side. It's constantly evolving.
Artists take on an alias that's suitable for their style of music. Everyone had a nickname when they were younger.