Dwarmin: I'm a little reluctant to allow this one. I don't particularly find the rich roleplayed very well very often. If you can persuade me otherwise, then sure.
Well, I feel the need to allay your fears, even if I do have some support. I would note my character is fairly one-dimensional just as described-I don't go into his motivations in any depth, his fears or his desires. Mostly because I don't really like padding my character before the game already starts.
I'm guessing you're worried I'm take too much power-essentially making a 'perfect' character, who has no flaws and wields control over the other players, super rich and super handsome and super super super. That was not my intention. He's not a superman, and I had no intention to play him that way.
I'll try and put in some more information that you get from reading between the lines. I really do try to put thought into all my characters!
He often wears expensive and tasteful clothes (Osrios is vain and protective of his image-this implies he worries about how other people see him, even when they can't see him.)
He's never seen riding without a signature leather jacket, beaten and torn, referring a Southern Terralban Gearball team called the 'Sharkteeth' (And yet, the possessions themselves seem not to matter to him, otherwise he'd have a nicer jacket. He's clearly willing to violate norms-this particular piece has emotional significance to him.)
The LaMerech family is one of the most powerful and wealthiest in Terralba-even more so in recent years, in great part due to their arms factories and mecha-bays which have been churning night and day to produce the arms and armament to keep the war machine going. (You'll notice how I describe my characters family first, instead of him? This was done intentionally. Osrios is often overshadowed by his family name.)
Osrios is the youngest son of his family line-out of the direct line of inheritance (Which means he's technically a pauper-he lives off his families generous allowance, but he owns pretty much nothing himself. Unless his whole family gets wiped out, the issue of his wealth shouldn't be an issue in the campaign.)
The LaMerech line doesn't exactly have a legacy of producing warriors (Implication-they believe dying is for the grunts. They just make the guns and butter.)
He's grown bored and unhappy of a life spent in little more than the pursuit of his own pleasures and amusements-of which, he is somewhat infamous in pursuing, if you pay credit to rumor-sheets anyway. ('Bored and unhappy' is a vast understatement. It also implies he gets a deal of social pressure on him to act certain ways...he has nothing to be proud of, except for his family name. Which he got by default, by being born.)
He defied expectations by demanding a combat-job (...And why would he do that? Do you really think he wants to live through this? He's the last person in Terralba that needs to risk himself in war, and it's not out of patriotism or duty.)
His family connections ensured him a seat in a mech (If you read between the lines, you can figure he didn't enjoy this, or the implications.)
He often points out his academy scores in handling and combat tactics were well above average on their own, more than enough to qualify him for his pick of postings. (He's dedicated, in any case-he wants to accomplish things on his own merits. He has natural skills he enjoys using. He's also defensive of his own accomplishments.)
Though he was noted to have barely passed in gunnery scores, due to his lack of nerve when firing on live targets. (But, he has trouble actually taking life. He might want to die, but killing doesn't come easy to him.)
His recent assignment to the 12th, however, was at least partly political in nature-giving the entire recovery operation an air of 'grandeur' and 'excitement' that they hope should translate back to the homefront-with the rebel son of a powerful, noble family unearthing war winning technological secrets. (Again, combine this with the above. How do you think he feels about being pulled away from the front line, where he has been fighting and dying with his friends, to join the 12th?)
Tldr, I'm making a rich guy, but calling him a 'rich guy' is antithetical to his entire character. His entire character arc is, in fact, trying to prove that he's more than just a 'rich guy'. That he has depth and personality, that he's a real person-not just a shallow caricature they paint him as in the rumor-rags, and indeed most of his family and friends probably see him as.
Ironically, that's the same thing I'm trying to do as a player in your game.