Welcome Ariel! I'm James! Lets get this show on the road, shall we?
First up is SIRIUS BLACK. Disgraced and disowned surviving son of the noble house of Black. He's a punk rock bad boy with a heart of gold and a serious soft spot for one Remus Lupin. Jokester extraordinaire, short-tempered and prone to tantrums and breaking things. He's in the Order and one of Dumbledor's more 'black ops' type agents. He plays fast and hard and probably causes a shit ton of collateral damage.
Next up is ANTONIN DOLOHOV. Anton is the big, strong, silent type. A brood machine that sort of stands in the corner and stands there quietly, always listening and watching. He's one of the best duelists you'll ever see and is currently high in the ranks of the Death Eaters. HOWEVER, now that Voldie and his crew are starting to maim, torture and sadistically murder people, he wants out. He just wanted to fight for purist rights, not become a serial killer. So now he's biding his time until he can find the perfect opportunity to defect.
HAMISH PODMORE! Poor little Hamish was kidnapped from his family at age four, was bitten by Fenrir Greyback and raised as his 'son' for years. Because he's been considered 'dead' or 'missing' all these years, he never got the chance to go to Hogwarts and is super envious of wizards, despite his father's contempt for them. He's a sweet innocent cinnamon roll who doesn't like violence, loves art and would just like to live peacefully and learn all the things he can. He also has no idea that his real family (including an older brother in the Order) is still out there and looking for him.
Last and least is WILHUFF MULCIBER! Cuckoo bonkers and batshit insane, Wilhuff has been around since Voldemort was 'Tom Riddle' and is one of the highest ranking DEs. He's a master con artist and expert in the realm of dark magical objects. He's smarmy and snarky and a bit of an asshole to pretty much everyone. He's very kooky and twisted, but somehow an expert strategist.