Sirius's brother and probably the most popular Slytherin is Regulus Black.
Most often portrayed by Timothee Chalamet
He is a great fancast and age appropriate but I think there is much room for diversity and new fancast.
YOU ARE READING
𝐌𝐚𝐫𝐚𝐮𝐝𝐞𝐫𝐬 𝐅𝐚𝐧𝐜𝐚𝐬𝐭𝐢𝐧𝐠 | A face claim/ fancast book| 1
Random"𝙀𝙫𝙚𝙧𝙮𝙩𝙝𝙞𝙣𝙜 𝙝𝙖𝙨 𝙗𝙚𝙖𝙪𝙩𝙮 𝙗𝙪𝙩 𝙣𝙤𝙩 𝙚𝙫𝙚𝙧𝙮𝙤𝙣𝙚 𝙨𝙚𝙚𝙨 𝙞𝙩" The first out of two marauders fancasting books