As his plays were featured by using a coffin, his contemporary wrote 'a play with a coffin might probably be a play written by Nanboku' (Ippo NISHIZAWA "Denkisaksho".)
作品によく棺桶が登場するのが特色で、同時代の人から「棺を持ちいたる狂言を見れば作者は南北なり」（西沢一鳳『伝奇作書』）と書かれるほどだった。