First off when is this set? I'm guessing modern day, but it would be rude to assume. Next, I was considering writing a Homunculus. Made during 1942 in a batch to fight in WW2 (or other arbitrary date that fits with the setting of the RP). 'He' (gender is rather pointless as a Homunculus, correct?) survived, but knows he is on borrowed time due to his expiration date. 

Thoughts? I didn't want to get too far into it if my Homunculus idea doesn't fit for now.