Immortalist - Text by M. Alan Kazlev; amended by Stephen Inniss A sophont who aspires to attain physical immortality through indefinite perpetuation of a biological, technological or cyborg body, or software equivalent. This involves various preservation and renewal measures, including intelligence modification such as life-memory archiving. Most immortalists end up losing their personal identity after a few thousand years at most.
A minor character from Darren Ryding's new Orion's Arm novelette "The Immortalist" (out soon), Tillika is a Siberoo. A splice between siberian tigers and kangaroos (with a few other things included for good measure), siberoos are a widespread and venerable clade of sophonts.