JikuPiku

"My dear little Pieck"

- Zeke

JikuPiku is the het ship between Zeke Jaeger and Pieck Finger from the Attack on Titan fandom.

Canon
Both Pieck and Zeke are warriors from the Warrior Unit in Marley, with Pieck inheriting the Cart Titan, and Zeke being the inheritor of the Beast Titan until his death.

Before participating in the Paradis Island Operation the two were the only two titan shifters who were behind in case enemy nations were to attack Marley. In 850 the two joined the operation in order to take back the Founding Titan as Pieck, Zeke and a few Marleyan soldiers head off to Paradis Island into Ragako, while in the village the people who inhabited there inhaled gas which contained Zeke's spinal fluids, as Zeke screams (due to having Royal Blood) it triggers the effect and turn the people of Ragako into titans.

Sometime later, Zeke, Pieck, Reiner, and Bertolt partcipate in the Battle of Shiganshina District to continue the operation, well known as the Paradis Island Operation. During the operation Pieck provided boulders to Zeke as he smashes it into pieces in order to throw at the scouts who were in Wall Maria to take it back. Soon the scouts plan to charge against the Beast Titan and kill it, Zeke throws the rocks at the charging scouts who all but one died, including the commander, Erwin Smith. However Zeke is soon ambushed by Levi as he cuts him from the nape of his tian freeing Zeke, before Levi can kill Zeke, Pieck saves Zeke just in time in her Cart Titan form before retreating back to Reiner and heading back to their homeland, Marley.

During the time skip they're both working together with Reiner and Porco against their enemies as war broke out between Marley and Mid-East Allied Forces after Marley lost the Colossal Titan and the Female Titan as they failed the Paradis Island Operation, which made them lose military power.

Fanon
The ship itself isn't quite popular due to having much popular rivals like PokkoPiku.