He is the grandfather of Nathan Adams.
Prior to the series, Nathaniel found a crystal marble along the riverside of his hometown, Harrisville. By peering into the crystal, Nathaniel discovered the world of Yo-Kai, ending up helping and befriending various Yo-Kai in need. The experience inspired him to make plans for a prototype that would become the Yo-kai Watch.
However, these plans caught the attention of Dame Dedtime, who sought to take over the world and wished to prevent the collaboration of humans and Yo-Kai. To this end, she had her underlings Kin and Gin Inspirit two local bullies and harass one of Nathaniel's weaker friends. Despite a prior promise to defend his friend, Nathaniel became overcome by fear and failed to do so, causing his friend to lash out at him for breaking his promise. Severely demoralized, Nathaniel resolved to push away everyone around him, rejecting both people and Yo-kai and abandoning his plans for the Yo-kai Watch.
In the future, this resulted in Nate's Yo-Kai Watch disappearing, necessitating Nathaniel's Yo-kai friend Hovernyan to find Nate in the future and bring him sixty years into the past. Although initially rude towards Nate, Nathaniel eventually warmed up to him after Nate (albeit reluctantly) agreed to play the role of his sidekick.
In order to rescue Jibanyan after he was captured by Dame Dedtime's minions, Nathaniel assisted Nate in mounting a rescue operation. With his courage and willingness to associate with friends restored, the Yo-Kai Watch manifested on both his and Nate's wrists, allowing them to call on all the Yo-Kai friends they made and defeat the Wicked Yo-kai.
Nathaniel gave Nate his Yo-kai Watch Model Zero, deciding to build his own and leave his future grandson with a memento of their time together. By Nate's present, Nathaniel had passed on and turned into the Yo-kai, Moximous N.
Nathaniel's role in Yo-kai Watch 2 is very similar to M01. He first appears in Chapter 5, in which he saves Whisper after he has been inspirited by a Wicked Yo-kai, by clobbering him repeatedly with his club. Upon meeting him in his secret base, where Hovernyan explains the situation to him, he simply claims he has no friends.
On his notebook, Nathaniel planned to create the Yo-kai Watch by using three parts found in Old Springdale, a Mysterious Marble, given by Nick Nack in Springdale Ironworks; a Swirly Bell, given by Komajiro in Mt. Wildwood Shrine, and a Top-Notch Watch, given by Mr. Goodsight in Timers & More. In Chapter 6, Nathaniel finishes the development of the Yo-kai Watch Model Zero and gives it to Nate. When asked by Hovernyan why he would not use it himself, Nathaniel states he has no Yo-kai friends and he won't make another watch, insisting he would fight alone. This is proven somewhat untrue, as Hovernyan shows Nate some milk bottle tops with the names of Pallysol, Faux Kappa, Gnomey, Predictabull, and Mermaidyn written on them, along with their locations. These Yo-kai fought along with Nathaniel to protect the village, and now they are petrified. After Nate de-petrifies and befriends all those five Yo-kai, Nathaniel, while training, recalls his traumatic experience of not being able to defend his human friend. Later, after Nate defeats Kin and Gin for the first time, Nathaniel rushes to the heroes' aid, and when the situation seems helpless, his Classic Yo-kai friends appear and, along with Hovernyan, drain the evil twins' energy, allowing Nathaniel to strike them down. After this, Nathaniel attempts to train Nate.
In Chapter 8, after the war between the Bonies and the Fleshies goes to a ceasefire, Nathaniel appears and uncovers the Wicked Yo-kai which were posing as normal Yo-kai in order to sparkle the conflict between both armies. In Chapter 9, Nate, Nathaniel, and their Yo-kai friends decide to go search for Master Nyada, and Nathaniel and Hovernyan head to Galeria Boulevard. Here, they don't notice Master Nyada at first, while watching Moximus Mask' TV show with him; however, everyone (except Whisper) find him and try to explain him the situation, but Nathaniel gets annoyed when the cat Yo-kai sleeps and sets off.
In Chapter 10, Nathaniel and Hovernyan reach the Industrial Zone where Dame Dedtime and her minions lurk. While Nate and Hovernyan tries to convince Nathaniel about to call for help from the Bonies and the Fleshies, Nathaniel simply scoffs at it and rushes in alone, in which Hovernyan later follows him. Here, Nathaniel and Hovernyan fight Kin and Gin while Nate and his friends decide to stop Dedtime. After Dedtime recovers herself, Nathaniel and Hovernyan are being worn off from his own struggle with Kin and Gin. When Hovernyan gets struck by one of their attacks, Nathaniel laments his perceived foolisheness and powerlessness, to which Hovernyan reassures his selfless actions make him a hero and shows the Milk bottle tops which he was trying to get up. Nathaniel, with newfound courage, calls upon the Classic Yo-kai to be friends; as if on cue, the Yo-kai Watch Model Zero goes from Nate to his wrist and the Milk Bottle Tops change into Classic Yo-kai Medals, which he uses to summon his friends and, along with Hovernyan, battle and defeat Kin and Gin. Finally, both heroes confront and defeat Dame Demona for the last time. Afterwards, Nathaniel parts ways with Nate in gratitude.
Nathaniel's appearance has an uncanny resemblance to Nate's, due to the latter being his grandson. Unlike Nate, he has tanned skin and wears a white tank top, beige shorts, a blue cape and wooden two-teeth geta sandals. He also wears a necklace with a small orange pouch.
Nathaniel is a very determined and confident kid who is obsessed with a superhero from a manga, Moximous Mask. His goal is to be the equal of Moximous Mask and often practices how to act like Moximous Mask. In the first movie, however, he is secretly haunted by a past trauma of failing to protect his friend, but eventually overcomes this and starts to trust people and Yo-Kai again.
Nathaniel is credited with the conception and creation of the Yo-kai Watch Model Zero, which later inspired the creation of the normal design in the games. He also created the prototypes for five Yo-Kai Medals, which would be complete before fighting against Kin and Gin alongside Hovernyan and five classic Yo-kai (which inspired the prototypes).
Nathaniel is agile and strong. He uses a wooden club to fight Wicked Yo-kai. He also has a sharp mind, being able to identify disguised Wicked Yo-kai who infiltrated the Bony Spirits and Fleshy Souls armies in order to sparkle further animosity between the two sides.
Upon their first meeting, Nathaniel did not trust Nate at all and often acted in a rude way toward Nate. However, as their journey progressed, Nathaniel began warm up to Nate. Nathaniel becomes impressed by Nate's resolve and abilities enough to trust him with the Yo-Kai Watch Model Zero. Likewise, Nathaniel is eager to teach him his battle dance and pose, which Nate gradually learns.
Lucy is Nathaniel's childhood friend and appears to be one of the few people Nathaniel opened up to. He later introduces Lucy to the world of Yo-Kai and his plans for building his own Yo-Kai Watch. Some time later, he married Lucy and had one known child, Aaron.
Prior to him passing away, Nathaniel left Lucy the crystal marble he found as a child, allowing her to see Yo-Kai for herself.
Mirroring the relationship between Nate and Jibanyan, Nathaniel is usually seen with Hovernyan. The two share a close bond similarly to that of Nate and Jibanyan.
Nathaniel was also seen to have helped and befriended the following Yo-Kai, allowing him to summon them at will:
- Castelius I
- Toadal Dude
- Instead of a Yo-kai Watch, Nathaniel uses a special crystal to see Yo-kai.
- Nathaniel was the first member of his family known to be reincarnated as a Yo-kai, called Moximous N.
Nathaniel is a variation of Nate's proper name Nathan which emphasizes how he is related to Nate. This also applies to his Japanese name as well, in which Kei-ta and Kei-zou have the same first two kana in their names when written out.
In other languages
- German: Nathaniel Adams
- Italian: Nathaniel Adams
- Portuguese: Nathaniel Adams