Heartiels (ハーチイエル,Haateieru?) 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.
The heartiel entrusted with the Book of Wisdom. In episode 22, she helped the Cures find a solution to fight the power of Baldez. At first she didn't like Nagisa but soon she came to like her after seeing how pure of heart she was. Her symbol is a book.
Pation: Passion. Sometimes Pation can be seen flying with a white dove and his symbol is a torch while his hair seems to resemble a flame. Most likely to represent the "Burning Passion" Oddly enough, his pigeon always lands on Nagisa's head.
Seekun (Shikun): Seek. The first of the Heartiels discovered. Seekun represents the Queen's sense of adventure and discovery. She ask many questions and seems naive about how things work. When the girls need help, its Seekun's job to call on the right one. She is also the last Heartiel to enter the Chairect and her symbol is a telescope.
She seems to prefer Nagisa, as she enjoys spending time with her more than Honoka.
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.