If I am not mistaken, and I may well be, that Bio of a Space Tyrant by Piers Anthony. 6 book series as I recall.
I didn't remember the orphan bit, bu I did the cheek tattoos. The most junior officer had a quarter (maybe one sixth) of a circle and the most senior Captain had a full circle. At the time, I thought he was trying to grab some "karma" from Trivial Pursuit.
I did not like it - too much senseless violence and cruelty, and too much rape of everybody. I don't know what drugs he was on while writing it, but it was a bad trip.