Ok, I will only raise females or castrated males (pre-castrated... I am NOT lopping off boy parts myself!).
Females are very, very friendly. Our last set would squeal with delight when I visited and flop over on their backs "ok, rub my tummy!". The loved to chase a rubber ball. The males are more standoffish. They aren't mean, just have zero desire to have their tummies rubbed (or even touched). The like to chase balls but would prefer you stayed outside the pen. The more you handle pigs, the friendlier they are. I handle mine enough that they either like me or have a healthy fear of me (as in I'm going to sit over here in the corner away from you and run like a bat outa hell if you touch me).
Intact males are MEAN. Hence why I won't have a thing to do with them.
You cannot raise a solo pig, they are herd animals. I raise 2-3 depending on how many people go in with me. I currently have 3 castrated males.
We like to butcher around 250-275lbs. Pig feed is HIGH due to the drought right now. My last batch of pigs all said and totalled I paid $2.99 a take home pound (everything from sausage to pork chops) that included all feed, all butchering costs, cost of the piggy and so on. Not bad for home-grown, organic pork.