PokkoPiku

"Really? Even though we're always fighting together?"

- Pieck to Porco Galliard

PokkoPiku is the het ship between Porco Galliard and Pieck Finger from the Attack on Titan fandom.

Canon
The two are both titan shifters in the Warrior Unit subdivision in the Marleyan military, in which Porco was the Jaw Titan before his sacrificial death, and Pieck is the current Cart Titan. The two are shown to be close friends and got much closer during the Marley Mid-East War. Pieck also gave Porco the nickname "Pock" (ポッコ Pokko in Japanese) as a way of affection although Porco does not really like the nickname by the looks of it. The two seemed like they've been friends since they were children when training together as warrior candidates.

Marley Arc
The two are shown working together assaulting their enemies in their bunkers in titan form as they're unauthorized to engaged in combat, eventually Marley comes in victory. After the war Pieck goes and visit both Porco and Reiner who's currently recovering and later leaves the room. Before Reiner leaves Pieck tells Porco to not pick on Reiner and then rests nearby Porco, which he replies saying it feels like he hasn't seen Pieck in forever although Pieck responds by saying they've been always been fighting right next to each other in battle.

Both Pieck and Porco are summoned to attend a meeting with Zeke at the Warrior's headquarters, before the meet had started Porco stumbles upon a crawling Pieck, in which he reacts frighten and asks Pieck what is she doing, she tells Porco that it's much natural for her to crawl on all fours due to the Cart Titan walking on all fours as she stays in her titan form for a long duration of time but Porco asks Pieck if she can walk upright like a normal human.

Before the two and the rest of the warriors attend the Liberio festival to hear Willy Tybur's speech they sat down in their seats as ambassadors of Marley before both Pieck, Porco, and the rest of the warriors getting called by a Marleyan soldier as Magath was calling them. The soldier leads Porco and Pieck to an empty room in which happens to be trap, both the two to fall into a pit that had a straw bed, as they landed they both fractured their bones.

A few chapter later Falco is shown removing Pieck's body from the cart titan as she's injured from the fight with the Survey Corps, Porco starts to think Pieck is dead and starts to think about the memories with her and wanted to avenge her (by attacking Eren) although she's not dead but instead greatly injured from the thunder spears used by the Survey Corps members.

Fanon
The shipped sailed among fans when Porco found Pieck crawling on the floor as it was supposed to be comedic between the two, Pieck and Porco are close friends and possible fan theory that one might have feelings for another (most believe it's Porco due to questioning and fan belief jealousy from Porco when Pieck hugged a another male character in her team) although it's never really shown due to the lack of appearances between the two, also due to the fact Porco is deceased. Majority of the shippers for these two is on the platform Tumblr.

PokkoPiku is the most popular ship for the two on AO3

Fandom
FAN FICTION

TUMBLR