"Old Master Roshi has in his possession a very powerful fan made out of a palm-leaf called the Bansho Fan. It's the only thing that will extinguish Fire Mountain."
The Bansho Fan (芭蕉扇 Bashō-sen, lit. "Banana Palm Fan") is a mystical fan designed to stoke and control the flames of the magical furnace.
"What?! The Bashō-Sen?! The magic fan that can raise a typhoon with a single wave, a thunderstorm with two and a monsoon with three?! That Bashō-Sen?!"
The Bansho Fan is thought to have been created from the feathers of the Hikui Bird, although this may be untrue as Master Roshi admits it to be a guess (in the original Japanese version, Roshi states that he was drunk when he wrote the book containing "instructions" to make the fan). Master Roshi once used the fan as a potholder, but he threw it away after he spilled wonton soup on it. It has the power to control weather, and is described by Roshi as having the capability to "create a strong wind with a single wave, a cloud with two, and a downpour with three." The fan was last seen in the possession of Goku in the last few episodes of Dragon Ball, when he once again needed it to extinguish the flames on Fire Mountain.
Video game appearances
In Dragon Ball Z Side Story: True Plan to Eradicate the Saiyans - Earth Saga, Piccolo uses the Bansho Fan to quell a storm near a volcanic area.
It is the Z-Fighter Exhibit #4 in Dragon Ball Z: Buu's Fury, with its description being: "A mystical fan capable of creating an extremely strong wind. The original Bansho Fan was owned by Master Roshi, but was lost. Goku and Chi-Chi made a new one." It is trophy No. 47 in Dragon Ball: Advanced Adventure, and also a treasure that can be found in the first stage of Dragon Ball: Revenge of King Piccolo.
"A round fan. It raises a typhoon in one wave, a thunderstorm in two, and a monsoon in three."
— Dragon Ball Xenoverse Accessory description
In Dragon Ball Xenoverse, it appears as an accessory for the Future Warrior which can be purchased from the Accessory Shop after completing the Demon God Démigra Saga. However its function is purely cosmetic and it cannot be used as a weapon.
- In "Dress in Flames", while in Octagon Village, Goku and Chi-Chi discover a giant rock with a map of how to make the fan. The instructions appear to be carved in the Namekian language, though it is a mystery what connection the Nameless Namekian had with the Bansho Fan.
- Other than the fact it is used by Piccolo (after fusing with Kami and becoming the Nameless Namekian) in Dragon Ball: Plan to Eradicate the Saiyans. Presumably the restoration of the Nameless Namekian gave Piccolo the knowledge of the Bansho Fan construction or Piccolo was able to create one with Magic Materialization using the Nameless Namekian's knowledge of its construction and magical properties.
- The Bansho Fan bears a great resemblance to a dansen uchiwa, a Japanese signalling fan also known as a gunbai or gunpai. This particular type of fan was made famous by Japanese warlord Takeda Shingen when he used his dansen uchiwa in a duel against Uesugi Kenshin during the Fourth Battle of Kawanakajima in 1561.
- The Bashōsen is based on a tool from the Chinese classic novel Journey to the West. In this story; there are two demon king brothers, known as the Great King Kinkaku (金角大王 Kinkaku-daiō) and the Great King Ginkaku (銀角大王 Ginkaku-daiō). The siblings possess five treasured tools, one of which is called the Banana Palm Fan (芭蕉扇 Bashō-sen). It is also based on the fan of , the character who Chi-Chi is based on.