PrincessBoots

PrincessBoots is the friendship between Fiona and Puss in Boots from the Shrek fandom.

Shrek 2
Puss was hired by Fiona's father to kill Fiona's husband, though Puss later befriends Shrek after he spared Puss' life. Fiona meets Puss for the first time when she heard from Donkey that Shrek took a potion to make himself handsome. She briefly considers that the cat on Donkey's back could be a transformed Shrek. Puss flirting with her confirms that he isn't. But it's not clear whether Puss knew if the princess was his new friend's wife.

Puss later assists in preventing Fiona from kissing Prince Charming, forcing her to fall in love with him. With Charming's mother defeated and Fiona and Shrek deciding to turn back into ogres, Puss starts a fiesta to celebrate the newlywedded couple.

Shrek the Third
Between the two movies, Puss and Fiona had become more accustomed to each other. So much so, that he schedules the new royal couple's day when they substitute for Fiona's ill father. After the untimely death of Fiona's father, Puss accompanies Shrek to find Fiona's cousin to be the new king, before which Fiona tells Shrek that she's pregnant. As Shrek grows increasingly worried about becoming a father, Puss admits that he loves Fiona more than anyone else, but offers to take Shrek on a vacation, believing it to be the best for everyone. Later when they collect cousin Artie, who drives them off-course after getting cold feet about the new responsibilities, the four of them teleport back to the kingdom of Far Far Away, only for Puss and Donkey to swap bodies. As Shrek confronts "King" Charming, Puss and Donkey are arrested and put into the same cell as Fiona, her mother and her princess friends. After they tell Fiona about Charming capturing Shrek and Artie going missing (and the body swap), they team up with the princesses to break out, storm the castle and free all of Charming's prisoners. After Charming's defeat, Puss ends up helping the new parents with their triplets.

Shrek Forever After
After Shrek makes the deal with Rumpelstiltskin and enters the alternate reality he made, he finds out that Puss is Fiona's pet in this timeline. Fiona seems to spoil him, buying him all kinds of toys and making sure he has a comfortable life. Puss seems to also be really close to her here, because he's the only one who knows Fiona's past in the tower.

Fanon
Despite both being main characters, PrincessBoots is a rarepair due to their general lack of one on one interaction. Most content focuses on their alternate timeline incarnations, exploring just how Puss became Fiona's pet. Many speculate that Puss was meant to assassinate Fiona on Rumplestiltskin's orders, with the story then playing out like Puss' friendship with Shrek, except that Fiona might've not seen much use for Puss and thus spoiled him.

Some edits pair them romantically, based on him briefly flirting with her in the second movie, but those are rare and tend to be comedic.

Fandom

 * FAN FICION