The Hoya Hoya no Mi is a Paramecia-type Devil Fruit that allows the user to summon a genie from their body, making the user a Lamp Human (ランプ人間,Ranpu Ningen?, Viz: "Lampman"). It was eaten by Charlotte Daifuku.
By rubbing their body, the user is able to summon a massive genie wielding a halberd to fight for them. The genie is immensely strong, able to briefly overpower even Sanji, a powerful fighter in his own right. No weaknesses are known outside of the standard Devil Fruit weaknesses, although it does seem that the user needs to keep continually rubbing their body to maintain the genie. It also has yet to give the user itself any superhuman traits; meaning they could be vulnerable without the genie.
Daifuku uses the genie summoned by this fruit to assist him in combat. The genie emerges from his belt buckle and attacks opponents with its halberd. While using his power, Daifuku continuously rubs his stomach.
Maji Giren (魔人斬 (マジギレン),Maji Giren?, literally meaning "Demon Cut"): The genie attacks an opponent by slamming down his halberd on them. In the event that the opponent is able to block the halberd's blade, the genie will then slam the halberd's shaft into them horizontally with considerable force, sending them flying back. This was first used against Sanji. The attack name is a pun on the normal reading of the kanji Majin Giri (魔人斬,Majin Giri? "demon cut") and Japanese slang Maji-gire (マジギレ,Maji-gire? "seriously pissed off"). In the Viz Manga, this is called Genie-uine Rage Split.