Mullin visits the Pandemonium Library along with Azazel and runs into the sleepy bookworm, Dantalion, as well as the ancient demon, Moloch, who always tends to talk in a loud voice. Later, Belphegor​ wants to come up with an excuse to talk to Azazel, so she starts making brownies with Beelzebub.
I'm Her Highness Beelzebub's 
assistant. The name's Mullin.
أنا مُساعد سموّها بيلزبوب، اسمي ميولين
Ich bin der Assistent Ihrer Exzellenz Beelzebub.
Mullin ist mein Name.
Soy Mullin, el asistente
de su excelencia Beelzebub.
Soy Mullin, el asistente
de su excelencia Beelzebub.
Mullin,
l’assistant de Son Excellence.
Sono l'assistente di Sua Altezza Beelzebub, 
mi chiamo Mullin.
Я помощник Её высочества
Вельзевул, Муллин.