Heartiels

Heartiels (ハーチイエル) are twelve fairies representing the will of the Queen. The girls must find each one and store it in the Queen Chairect, the heart of the Queen, to make her whole once more. Each represents a virtue and when needed, Seekun will turn a knob to release the one they need.

Trivia

 * Eternalun and Hapinen both resemble the character/species "Toad" From Super Mario. Eternalun's hat is the cap of a Toad, while Hapinen's outfit is the same worn by toads.
 * Horpun bares a very vague resemblance to both Len Kagamine from VOCALOID and Link from Legend of Zelda.
 * A lot of the Heartiels seems to interact with Nagisa more then Honoka.
 * Horpun is the only Heartiel who has a unique color that another Heartiel doesn't have some relation to. (For example, three Heartiels have blue for their color. Two have red, pink, green, and purple. But none have orange or yellow, other then Horpun and Seekun.)
 * Prosen's clothes resembles Luigi's outfit from the Mario series because of the green shirt and blue overalls.