Asc 2 John is so MOE simply because he still tries to act kingly to Fujimaru even when he keeps telling everyone and himself that he is the most worthless king in the world. For example, his 3rd dialogue in My Room:
「貴様と余の関係? そんな事をよりにもよって俺───あ、いや、余に正面向かって聞くか普通。愚か者め」
He switches from using the first-person pronoun 「俺」 (ore) to 「余」 (yo) - the one that is used for a person with king status. English equivalent to this is switching from casual "I" to the royal plural "we", I think. I would translate this line to this:
"The relationship between you and me? Who in their right mind would ask ME—ah, no, US—that question to OUR face? You fool."