If you want it directly taken from the name, you should totally use Len =D it sounds cool

cool, thanks!

I think if you're going to have Freedom's nickname be Free, which is a natural and good nickname for her, you should make up a nickname for Silence that isn't derived from his given name. It would sound a little cheesy if your main characters are names Freedom and Silence, and then their nicknames and Free and Si. It sounds lazy if both of them are like that, but just one is natural.

Maybe pick a nickname for Silence based on his personality? Like, I have no idea what he's like, but I'm assuming he's quiet, shy, etc. so maybe a sacrcastic/ironic nickname like "Tongue" or "Loudmouth", something that's unexpected or funny.

Use 'Len' Its good and easy to say and remember-well thats what nicknames are.

I think I like "Siren",it means"sound" and quite opposite with"silence"

what about sil?
i know its lame but when girl are named jillian their nickname is usually jill or when a boy is named william they are called bill or will.
sorry if im no help at all.

all of these are really good- must think on it more- probably Len or Siren.

Yay you should try Len or Siren-they are cool name for Silence