Rumor: The Philippines can be seen in Episode 01 and the first chapter of volume 1. She is a maid that serves Spain a drink at the conference.

Fact: False. Though some fans have speculated that the maid was meant to be an uncredited cameo of a Philippines character, the maid was intended to be a normal human and is simply credited as "Maid" in notes and in the anime guide WorldWideWalking. Proponents of the Philippines theory believe that she was not named due to controversy, though the truth is that a character for the nation has yet to be introduced in the series. Though it seems unusual for there to be a non-nation character at the conference, the series has shown instances of the nations interacting with normal humans before. In some cases, the humans are shown to be aware of the nations not being like them, and address them by their nation name (ie: A medicine store clerk referring to Germany as Mr.Germany).
It was also speculated that a mysterious character labeled Asia3 was Philippines, but her identity was not clarified by Himaruya for the longest time. "Asia3" was shown to wear an outfit that some fans believed to be a maid dress, though the sketch was messy and the quality was not clear enough to tell exactly what kind of outfit it was. A later series of blog sketches revealed that the female character was actually intended as Vietnam with an alternate hairstyle.
The conference maid is also notable for having brown hair and green eyes like Spain, something that would not be likely for a representation of the Philippines. Himaruya himself had also clarified that the maid was a Spanish housemaid, when asked by a fan who she was.