Charlie

Charlie was the half-sister of Queen Jasmine von Smith of Vistria and a member of the Archtide Dragoons adventuring party.
After seeing Jasmine die in the first battle of the Shatterwar, she assumed her sister's identity and ruled in her stead, claiming that it was Charlie who had died and that she could not remove her helmet due to extreme scarring.
The fact that she had to commit this impersonation to take the throne may imply that she was not Jasmine's heir, either due to Jasmine having a child or another sibling or due to their shared parent not being the royal one. Then again, she may simply have developed a delusional personality disorder from the trauma.