"Even before the custard on his head started to take shape, this little Cookie dreamed of becoming a glorious king, worthy of the title borne by the greatest rulers of the past. Custard Cookie III, as he prefers to call himself, may not rule anything yet, but looking at how active he is at waving his scepter and giving orders, it is only a matter of time before he sits on a real throne. And his determination is remarkable! Made of simple colored paper, his royal regalia looked so realistic that even the notorious Chili Pepper Cookie got confused once! These days, Custard Cookie III is busy recruiting supporters to witness his future crowning. Perhaps you could become one of them?"

Custard Cookie III is said to have many similarities to Vanilla cookie in personality. Custard Cookie III longs to be the king of the Vanilla Kingdom much like Pure Vanilla Cookie already is. Due to this, Custard Cookie III harbors an intense respect and idolizing of him, holding this opinion long before he even met Pure Vanilla Cookie.