@Darkion
That's basically the merchant future I was talking about, more specifically selling otherwordly stuff because it's better than other stuff or he can get it way cheaper.
But after doing that for some time, he'll still need some serious protection, which essentially boils down to 3 choices
1. Tamed monsters like Feru and Sui
2. Adventurer bodyguards for longer periods of time or for each travel
3. Permanent bodyguards (could be slaves if slavery is a thing, unconfirmed other than mindslavery tools existing), but would otherwise be someone he's essentially paying a salary to protect him. Could be someone he helped saved with medicine and then repaying the favor with service, could be straight up payment , etc.