Well I got my username from Taekwondo and Judo training back when I was 18, there used to be a very skilled fighter that injured others so one day I was randomly pitted against him and I defeated him, because he injured people they nicknamed him death so when I defeated me they called me "New Death". They still call me that even though I'm 24 :P
Kimiko Cronos: Got Kimiko from a character of a show I use to watch, and Cronos from the password "Kronos" on the Incredibles. (Just change the K to a C) Plus she is a character on a story I'm working on.
Roronoa Sakamoto: Had Roronoa Zoro on the mind so I toke the first part, and I forgot how I came up with Sakamoto.
Niko Bellic: Partially had GTA4 on the mind.
Solance: It's Kimiko's alt. personality. I toke the word Solace, for I liked the definition of the word, and added an "N" to make it unique :p