Piña Co Lada (ピニャ・コ・ラーダ, Pinya Ko Rāda) is the 19-year-old daughter of the Emperor Molt Sol Augustus and his concubine, Countess Nell. She has two brothers, Zorzal El Caesar and Diabo El Caesar both of whom were candidates for the next Emperor. She is also the leader of Rose-Order of Knights. Realizing at an early stage the impossibly huge gap of strength between the Empire and Japan, she chooses to ally herself with the JSDF to stop war and protect her home country.

After meeting Itami, she was exposed to the Otaku subculture and was strongly influenced by it. A princess from the empire that rules the other world, she wishes to establish peace with Japan, as she knows that there is no way for the empire to stand against the JSDF's military power, and a war with them will eventually lead to their destruction.