Snartle has long light beige spiky hair and brown slender horns. He wears an teardrop shaped Oni mask that functions as his face, with the tip, eyebrows, and lips tidal blue and also the eyes and teeth in shades of yellow, a dirty green robe with brown armor, a dirty green hakama, and zori. Snartle carries two katana swords in both of his hands.
Snartle is a strict Yo-kai who comes after misbehaving kids. In Yo-kai Watch, if the player crosses the street 5 times (only at areas with a crosswalk sign) without changing the signal beforehand, Snartle will attack them to teach them a lesson.
In the anime, Snartle wants to teach city kids how to behave, but he finds that he cannot do so due to modern laws prohibiting the usage of his swords, making him depressed. As such, he desires to find a new form of being useful.
In the games, Snartle is very powerful even by S-rank Yo-kai standards, as he can single-handily wipe out an ill-prepared team of six Yo-kai. It should be noted that the Traffic Light-event Snartle's power is influenced by the Watch Rank of the player's Yo-kai Watch.
In the anime, he can be seen by people without a Yo-kai Watch due to him being a renowned Yo-kai, being a living parallel of the bogeyman.
Yo-kai Watch animation series
Snartle appears in Yo-kai Snartle when he is seen terrorizing a crosswalk, looking for naughty children. He is arrested by the police for brandishing his swords, and eventually released on bail. The experience, combined with his recent inability to scare kids into behaving like he used to, leaves him surly and depressed. With the help of Nate, Snartle initially uses his swords to make juice for children, but this idea is quickly abandoned as it failed to encourage good behavior. Nate then summons Toiletta to remake Snartle's image. Toiletta decides to give Snartle a makeover by dressing him up similar to a mob boss, rechristening him as Boogey Woogey (NAMAHAGE in the original), and repurposing his sword motif to a golden trinket on a necklace. With the help of Toiletta, Snartle pulls off a wildly successful publicity campaign that lands him major roles in advertising and film, culminating in the two Yo-kai enjoying life in a swanky downtown office, and Snartle being the most popular Yo-Kai on the planet. However, Snartle's pride is shattered when Nate points out that Snartle isn't scary anymore, causing him to burst into tears and beg Toiletta for another image makeover, which she agrees to. The two Yo-Kai are then abruptly arrested by the IRS for tax evasion and make the headlines.
Snartle will attack the player if they go past crosswalks without pressing the button ad waiting for the green signal five times in a row. Snartle can be befriended through normal means this way. Snartle's strength will scale to your current Yo-kai Watch rank, so it is recommended that the player should try to fight him early on with good pulls from the Crank-a-kai.
Alternatively, Snartle appears in empty apartments and under cars in Tranquility Apartments in Shopper's Row.
Yo-kai Watch 2
Snartle will appear the same way as in Yo-kai Watch. If the player go past crosswalks without pressing the button ad waiting for the green signal five times in a row, Snartle will attack them.
Yo-kai Watch: Wibble Wobble
Snartle can be freed from the Crank-a-kai with 3000 Y-Money, a Special Coin, a 5-Star Coin, an Exciting Coin, or a Red Coin.
Yo-kai Watch Busters
Snartle can rarely be befriended as a reward for clearing the Chapter 10 mission, Seriously Match, Red Light Busters, alternatively he can be freed from the Crank-a-kai with his own Boost Coin the player can use with the Crank-a-kai which ensures each time the player dont free him the chance rises.
Snartle can be freed from the Crank-a-kai with a Sawtoakushi Coin (Wei), which ensures each time the player dont get him, the chance rises.
Yo-kai Watch 3
Snartle will appear the same way as in Yo-kai Watch and Yo-kai Watch 2. If the player go past crosswalks without pressing the button ad waiting for the green signal five times in a row, Snartle will attack them. However, Snartle will only show up in Springdale.
The player can also befriend Snartle in a Busters-T Dungeon trawlings.
"Snartle" is a combination of "snarl" and "startle"
Snartle is based on the Namahage (Japanese: 生剥,Namahage) (also his Japanese name), a boogeyman from the Oga peninsula in the Tōhoku region. During New Year's, unmarried men of Oga dress up with oni masks and straw coats, and go around scaring girls and children brandishing a large kitchen knife and a wooden bucket, while chanting "Any crybabies in here? Are there any naughty brats?" (Japanese: 泣く子はいねがぁ? 悪い子はいねえか,Nakuko wa inee gā? Waruiko wa inee ka?).
The creature's name derives from namomi, the heat blisters one gets from sitting by a heat source for too long and often, and "(to) peel off" (Japanese: 剝げる,Hageru). The kitchen knife signifies the threat they'll peel the namomi off of any lazy bum who spends all winter in front of the fireplace doing nothing.
People of Akita developed an origin myth for the Namahage about demons coming from China to invade the region, but some folklorists believe it was originally a kami visiting from the sacred mountains, to admonish villagers and warn them to prepare for the rigors of winter.
Snartle gives a Fruit Milk when encountered via Streetpass
Snartle is the first Yo-kai from the English Recap Time to be skipped over and pushed to a later date, due to the episode being based around April Fools.
As of Yo-kai Watch 3, Snartle is the only Rank S Yo-kai to evolve into another form.