Micah Probably has never met him as I doubt her werewolf social circle is particularly wide.
Augustus Will find him delightful once he lets his purist flag fly free. In the meantime, Sinistra was treated at Mungos as a child after her accident, so I'm sure she's made more than one handsome donation to his charity.
Amycus Sinistra has an entire draft chapter in the new book she's working about about the institutional disenfranchisement of good wizarding families as an impact of muggles and muggleborn on the wizarding economy and wants to talk to you Carrows because case studies.
Severus She might know Severus in passing from the apothecary shop he was working at, as she takes potions fairly regularly to sooth her bad leg