Shadow king James. Remember though, when you play of game of thrones you mod or you die.
She of course knows of Sirius. "Bad Boy of House Black Disowned by Parents" an op-ed by Rita Skeeter. Even though she's never actually met him. Collateral damage makes for good editorial though, so do carry on, Sirius. Rita gives you her blessing from afar.
She and Antonin were only a year off at school, so could possibly know each other. That dude looks like he has hella secrets and Rita wants to know what they are but also kinda wants to be bros and binge out on dark chocolate and whiskey with him while they talk about what fucks the upper administration of the Ministry are (the UnderSecretrary keeps trying to ban press personnel and she's pissed).
Hamish and Wilhuff she wouldn't know. Unless like Hamish wants a job as one of Rita's many pretty boy PA's who fetch her coffee and tell her her shoes look nice and inevitably quit because Rita can't remember their names. She's the worst, basically.