Assalamualaikum (peace be upon you)! So here's a book about Brunei, where you can refer to this book to write Hetalia-ASEAN fanfics that include Brunei. I'm a Bruneian who got B for History (and C for Geography) of O level exam.You are allowed to ask stuffs about Brunei. Cover from the internet: A Bruneian did this so yeah, the drawing looks good enough. For non-Bruneians, this is a good opportunity to read for learning stuffs about Brunei.