Aisho is a Rock Human working as a security guard who secretly belongs to the Locacaca Organization as a dealer. When Yasuho Hirose and Tsurugi Higashikata tail him in order to investigate the Locacaca, he unleashes his Stand, Doobie Wah!, on them.
Aisho is a slender man of average to below average height. His usual outfit is composed of a skin-tight black bodysuit with a hole in the chest, khaki shorts with a belt, and what appears to be layered sleeves tied around his neck. He also wears what appears to be a pair of sleeves wrapped around his head, allowing some of his hair to poke out through the holes.
Aisho is very nervous and paranoid most of the time. When he is upset, he tends to overreact to small things, such as a group of birds in the park. He is also easily frightened and intimidated by enemies he can not see. He can get so worried that he will briefly experience flashbacks to previous traumatic times/experiences. Aisho was once revealed to have been less capable of controlling his rock physiology, and may very well still be. This is evident in his inability to wake up for at least a month every time he falls asleep. It is a combination of this fact and his naivete that led him to misplace his trust in a previous lover which culminated in her cheating on him and selling his house while he slept in his rock form.
It seems to be implied that Dainenjiyama has some sort of heart condition, as he is commonly shown with several 'Doki Doki' sound effects (a Japanese word that refers to the sound of a beating heart) around his person. This is reinforced later when he is shown taking pills for his heart.
Aisho seems to have had a genuine love for his former girlfriend. He is also somewhat gullible or easily swayed, as Josefumi Kujo and Yoshikage Kira easily managed to influence him into buying a specific medicine by making him believe it was highly sought after, even if he didn't seem to need the medicine.
As a member of the Locacaca Organization, Aisho is ready to kill anyone who might learn the secret of the Locacaca and was ready to kill Tsurugi Higashikata, a little boy and the son of his associate Jobin Higashikata, in cold blood.
- Main article: Doobie Wah!
Aisho's Stand Doobie Wah! is able to create miniature tornadoes that automatically pursue its targets. It is capable of cutting flesh using the tornadoes' bases. This Stand is incredibly powerful, almost impossible to avoid or negate without ceasing to breathe entirely.
Aisho was originally born as a nameless Rock Human. At some point in the past, Aisho acquired his identity as "Aisho Dainenjiyama", worked as a security guard at Morioh's baseball stadium. At the same, he was employed as a dealer for the Locacaca Organization.
In the past, Aisho owned a house and property in the countryside which his girlfriend would frequent during his periods of consciousness. During one such occasion, overcome with love and trust for this woman, he confided in her his secret and the conditions that caused him to disappear for a month at a time, thinking that she could be relied upon. Due to this mistake, after waking up from his next sleep cycle he was shocked to find that his house was being demolished. His friend Yotsuyu Yagiyama rescued him and explained to him the situation; his girlfriend had not only cheated on him while he slept, but had also stolen the deed to his land and sold it to property developers so she could disappear with the money.
Aisho eventually came to be employed at the stadium that Yotsuyu designed. While secretly importing the fruits from Port Moresby to Morioh, Aisho was discovered by Yoshikage Kira while in rock form after the crate he was hiding in was damaged. Kira would then follow him and discover the trade of the Locacaca. He is shown making a trade with the loca baseball star Atsunori Iwakiri, giving him a Locacaca for 200 million yen. At the same time, he's observed by Kira.
Eventually, Kira and Josefumi Kujo stole a branch of the Locacaca from Aisho. In a local pharmacy when another client, Josefumi took all the boxes of an eye medicine called "Eye Eye Syaa" save one, openly praising its potency and rarity. When Kira asked if there are any Eye Eye Syaa, Aisho was persuaded of its value and quickly took the last box for himself. On his way to another sale, Aisho tried the medicine. At that moment, Killer Queen burst a motorcycle's front wheel and caused an accident, which caught Aisho's attention. Immediately after this, Josefumi stealthily opened the case that Aisho uses to transport the Locacaca and stole some branches, replacing them with branches from another tree. Aisho didn't notice the theft as his sight is partially blocked by Soft & Wet's bubbles. Josefumi and Kira then depart, having successfully stolen the Locacaca branches.
Confronting Yasuho and Tsurugi
- Main article: Doobie Wah (story arc)
Aisho is first introduced into the story being viewed via Paisley Park interfacing with the security footage of Jobin being handed the mysterious fruit at a red light by Aisho. Yasuho proceeds to use her abilities to track his movements back to the stadium where he works and she theorizes that he must be keeping the trees which grow the fruits there.
Through the combined powers of Paisley Park and Paper Moon King, they are able to follow him by shaping a phone into one of Tsurugi's living origami. After witnessing Aisho delivering the fruit to an elderly wheelchair ridden man they observe it's restorative abilities first-hand; regenerating the man's lost leg while simultaneously performing 'equivalent exchange' by rendering him blind, although he rationalizes this by saying he can always buy another fruit to restore his sight and perpetuate the cycle.
Aisho soon realizes he is being followed and stomps on the origami, causing proportionate damage to both Yasuho and Tsurugi, and if not for Tsurugi's Paper Moon King making Aisho incapable of differentiating between the living origami and the surrounding foliage, their combined Stands would have not escaped. Distraught at the revelation that multiple Stand-users appear to be following him, Aisho promptly attempts to get in contact with Yotsuyu only to become more distressed when he finds that his number is out of service. Fearful that unidentified parties might have done something to his friend, he activates and sets his Stand Doobie Wah! on his trackers in hopes of killing them swiftly.
While his automatic Stand pursues the two of them Aisho tracks Doobie Wah!'s movement while contacting Jobin Higashikata to inquire about Yotsuyu's status and to see if he is in any way involved in these occurrences. Satisfied that Jobin is telling the truth, he converges on Yasuho and Tsurugi's location after the pair have had several near-fatal encounters with his Stand and confronts the two on their motives.
No sooner than he discovers the identity of one of his stalkers to be that of Tsurugi Higashikata, Jobin's son, does Jobin himself arrive on the scene. Aisho quickly turns to question Jobin about his involvement in this conspiracy and to force him to consent to Aisho killing Tsurugi as a means of assuring his sincerity. However he is too late to discover that Jobin's figure is none other than the distorted image of an approaching bus and that he has been under the effects of Tsurugi's Stand this entire time. This revelation comes too late, however, and he is struck by the bus and killed, at which point his body shatters into rock and is scattered across the street.
- JJL Chapter 39: Doobie Wah (1)
- JJL Chapter 41: Doobie Wah, Part 3, p.3
- JJL Chapter 41: Doobie Wah, Part 3, p.4
- JJL Chapter 42: Doobie Wah, Part 4, p.4
- JJL Chapter 42: Doobie Wah, Part 4, p.5 p.17
- JJL Chapter 40: Doobie Wah, Part 2
- JJL Chapter 51: Vitamin C and Killer Queen, Part 2, p.5
- JJL Chapter 42: Doobie Wah, Part 4, p.38
- JJL Chapter 42: Doobie Wah, Part 4
- Vitamin C and Killer Queen (story arc)