Usopp's Arsenal/Kuro Kabuto

A smaller, dark version of the original Kabuto, named "Kuro Kabuto" (“黒”カブト) was developed by Usopp during the two year timeskip. It is first clearly seen and named when Usopp fights against the guards of Ryugu Palace. Besides being more easily portable compared to the previous Kabuto (just slightly larger than his old slingshot, the Ginga Pachinko), no other upgrades have been revealed. He uses it in conjunction with his Pop Greens.

Pop Green
After two years of training with Heracles, Usopp has gained mastery of a new type of powerful weapon: the Pop Green. They are seeds of hostile plants that can grow at incredible speed. According to Heracles, these seeds have various uses, especially in combat. Usopp uses these seeds as ammunition for his new slingshot.


 * Midori Boshi: Devil (緑星・デビル): Shooting a Pop Green, Usopp creates a large carnivorous plant (that vaguely resembles a Venus Flytrap) which attacks his enemies. In addition to being able to eat enemies with its large mouth, it can ensnare those nearby with its vines. This was first seen used against Demalo Black and the fake versions of Franky, Nami and Sogeking for harassing the real Nami. In the Viz Manga, this is called Green Star: Devil.


 * Midori Boshi: Sargasso (緑星・サルガッソ): Usopp fires a Pop Green at his target, which then explodes into an array of resilient seaweed, strong enough to delay an avalanche of rock and earth. The name of this attack is similar to the Sargasso Sea, a region of the North Atlantic Ocean where ships often become tangled in weeds.


 * Midori Boshi: Rafflesia (緑星・ラフレシア): Usopp fires a Pop Green at his enemy, not aiming for them specifically but a place near them. The pop green reveals a rather large Rafflesia flower. The flower then excretes a foul smelling odor, disabling the enemies with its stench. This was first used against Hody Jones and his men.


 * Midori Boshi: Take Jaberin (緑星・竹ジャベ林): Usopp shoots a Pop Green and stalks of bamboo shoot up from the ground, stabbing and impaling anyone it crosses paths with. It was first used against some of the New Fishman Pirates. The pun is rin (林) and javelin.


 * Midori Boshi: Dokuro Bakuhatsu So (緑星・ドクロ爆発草): Usopp shoots a Pop Green that explodes upon impact. It releases a dense cloud of gas in the shape of a skull. It was first used to get Daruma out of the ground by smoking him out of the tunnel system he dug.