Rarity

Rarity is a unicorn and one of the main characters in the show. She represents the element of generosity.

The crush of Spike
Throughout the series Spike had a crush on Rarity. He did once he saw her in "Friendship Is Magic"  (Part 1). Rarity kissed him twice in '"Secret of My Excess", first because of giving her his firerubby and second because he saved her from himself. It was a secret until he told Twilight and Pinkie Pie in "Green Isn't Your Color".

Rarity shows a more caring and sensitive feeling for Spike in "Dragon Quest" and calls him "Spikey-wikey." She stands up for him when Applejack, Pinkie Pie, and Rainbow Dash pick on him and when Spike decides to join the dragon migration only because she said that he is cute.

In "Spike at Your Service", Rarity pretends to eat Spike's disastrously burned pie to make him happy.

Spike is even submissive in his devotion to Rarity. In "Green Isn 't Your Color", he gladly offers his body as a pincushion for Rarity to use while she designs a dress. In Party of One, he takes out Rarity's garbage and addresses her as "most beautiful one". He looks at her lovingly even after she says he smells "like a rotten apple core that' s been wrapped in moldy hay and dipped in dragon perspiration."

In "Castle Sweet Castle", Spike is seen waking up holding a beanie version of Rarity

Personality
Rarity cares for her own beauty and others. Rarity is also particular about her cleanliness: she panics while trying to avoid getting muddy in"Look Before You Sleep"and tries to keep herself from getting soaked in the rain to avoid it messing up her mane. This causes some conflict with her friend Applejack, who is, by contrast, not at all bothered about getting muddy or wet. Her fashion consciousness extends even to times of peril. But even so, she will get dirty if she needs to, as seen in "Sisterhooves Social" when she gets covered in mud to restore her sistership with Sweetie Belle.

Generosity
Part of Rarity's willingness to get messy for others is her generosity. That is her Element of Harmony, and she demonstrates it in "Rarity Takes Manehattan".The unscrupulous fashion designer Suri Polomare uses it against her by asking for some of the unique material Rarity made to "accentuate" her own dresses.