Robyn here, with my newest, Griffin Dukelow. He's a halfblood (if only just, muggle mother, muggleborn father) and ex-Slytherin (again, only just, he's 19 and finished school last year). He's an artist who is currently living off his parents, but soon will need to get a job because they're not going to foot the bill for much longer, even if they can afford it. (They only paid for him thus far because he was in Paris studying painting and has only been back for like, 3 months . It's a grace period to get on his feet, which they are disappointed he hasn't taken advantage of by getting a real job.)
He's a purist, despite his blood status, and thinks his parents don't conduct themselves right. He thinks the wizarding world should be more isolated, not mingling and tempting discovery the way muggleborns and half-bloods live. He is a lover, not a fighter, but he does think the DEs have the right idea, give or take.
He thinks people should be happy, though, and one aspect of purism he doesn't subscribe to as devotedly is traditionalism. He isn't grossly improper, but he lacks the hoity toity manners, or any inclination to learn. Personality wise, he's kind of silly and a little impulsive and believes in karma and things happening for a reason and etc, but he's pretty quiet usually. He writes more than he talks, but he's still not like... suuuuuuper verbose.
Ummm. He lives in Hogsmeade next door to Felicity Banges and will probably get a job in a shop there. He needs friends, frenemies, past acquaintances, and all sorts of stuff.