Today I cracked. No, not crying whilst watching. I do that a lot. I had a look around the great wide Series of Tubes and I found a copy of "Nana Best", by Olivia and Anna Tsuyichi (or whatever her second name was). They're the two real-life singers who do the vocals for Nana [BLAST] and Reira [Trapnest]. And guess what one of the extras on the CD is? A cover of "Anarchy in the UK"!
Right from the start Ren reminded me of Sid, so I was so chuffed when the references started getting obvious and I realised he was actually modelled on them. When I actually looked up a picture of Sid Vicious (I'm a fan of music, not singers) I couldn't believe it - Ren isn't just based on him, he is basically just an animated version.
EDIT for implied spoilers.
*~Pips~*