Cocoa powder has a highly concentrated chocolate flavor and packs much more of a punch than chocolate chips or bars. It is unsweetened and can be extremely bitter if consumed on its own.
The four main heroines who have been around since the original Persona 5 appear in the Jade City Foods Persona 5 Royal hot cocoa line.
There are many types of cocoa powder to choose from, but some high-quality brands that pack a powerful punch include Guittard's Cocoa Rouge, Ghirardelli Majestic, and Valrhona Pure cocoa powder.