Sen was born in Toledo, Ohio to a middle class family. Growing up he spent hours on end being a typical kid: Riding bikes, skateboarding, playing baseball, etc. He never really wanted or cared about material possessions. Sen was a regular "boyscout" being a leader, but cautious and stuck to the rules he deemed necessary. Sen always knew he wanted to be a Doctor, but solidified his choice to be so when his best friend was hit by a train and became double amputee right before his eyes. He did everything he could to try and keep his friend alive, and by a miracle succeeded with two belts and his resolve. His adrenaline pushing him through the blood and screaming to deliver his friend to a nearby diner where a officer was enjoying a meal, and rushed them both to a hospital nearby.
Sen met his wife Dema, in medical school. Dema was the light of his life, and they were very competitive during clinicals, only to have it all "shake out" in the rest areas of the Training Hospital they attended. Within four years Sen married Dema and was made a resident, and two years later had their first child Aiden, whom he was very close with. A year after came his wonderful daughter Mina. The four of them lived happily as a family, summer camping trips, hunting and fishing, Disneyland, family game nights. Dema working as a Surgical doctor, and Sen as a Doctor of General Medicine mad very good money, but it wasn't fitting him. After 9 years of working in Hospitals Sen became interested in becoming a doctor worldwide with only being a good person as his drive. Dema, and the children agreed that he should do it, but only with little worry about his absence. Sen assured them that every chance he could come home he would. Sen headed out with a group of medical humanitarians to help the ill, and wounded aftermath of the Chernorussian wars. What he believed would be a short year or two, turned into an indefinite tour when he became stranded by the accompanying government groups that knew far more than they wished to share. One morning, he and his fellow crew awoke to a desolate camp quietly and quickly torn down, and ravenous crazed lunatics everywhere. Sen was able to escape with a small crew of medics, but one by one they fell to this new plague, and suicide. Sen travels the wasteland cautiously looking not only to help those in need, but also any willing to help him survive.
Sen constantly misses his family in Ohio, but years have passed and without a means to contact them, it could only be safe to assume they have moved on. He is alone.
Sen does not allow himself to harm any individual for any means. His Hippocratic oath stands as both his mental barrier to the insanity around him, and his greatest Achilles heel.