Tomnyan has a similar appearance to Jibanyan, but his fur is a yellow-ish color instead of red, his haramaki is red and blue striped instead of yellow, and the sphere shape is now a silver bell.
Tomnyan is loud and likes to rave about America being great. Nate and Whisper comment about him after listening through his long discussion about America. However, in terms of laziness, he is very similar to Jibanyan.
Tomnyan enjoys eating Deliciousticks and going to Lady Nya Nya concerts as well as reading magazines revolving around her.
He says "meow" as a sentence ending as opposed to Jibanyan's "nyan" and has a deeper voice.
When Tomnyan inspirits a person, they become an American stereotype, gaining blonde hair, blue eyes and a handsome mouth, they will also randomly use English words. His signature move is "One Hundred Paws of Fury!", like Buchinyan using "A Million Paws Of Fury!"
He is also very skilled at playing the guitar and singing. USApyon loves it, Nate and Whisper are neutral, if not cringe about it, but Jibanyan hates it.
In EP161, Tomnyan, along with nearly all the cat Yo-kai, were summoned all together due to Gojidatsujii's power changed the Robonyan F's Dream medal's name to 'Nyan'. Unfortunately, shortly after Gojidatsujii ran away for his life, Nate accidentally said that he summoned all of them for nothing. This unintentionally upsets the cat Yo-kai and this led to them proceed to beat up Nate and Whisper as the episode ends. During this end scene, Tomnyan is one of those Yo-kai who didn't weld a shinai (a type of bamboo-made katana made for practicing kendo) while beating up Nate and Whisper and in his case, he is seen welding his guitar instead.
They live next door to each other and are both friends and rivals. They like to argue on which is better, America or Japan, usually comparing things that they like, like favorite food or band. Jibanyan hates how he gets all the attention. He also hates how excited Tomnyan is about the USA, he also is a bit confused at first on why Tomnyan says "meow." The two exchange questions about the other's respective catchphrase ("ていか「ミヤウ」ってなんニャン?"- Well, What does "meow" mean, nyan? (Jibanyan), and "ていか「ニャン」ってなんミヤウ?"- Well, what does "nyan" mean, meow? (Tomnyan). However, the two cry and get along when thinking of their respective backstories, being how similar they are.
Usapyon and Tomnyan first meet thanks to Nate and the two seem to hit it off rather easily and get along quite well due to them both being Merican Yo-kai. Usapyon enjoys Tomnyan's singing, unlike some of the characters, even dancing to it. However, this does not stop him from turning Vader Mode at him whenever Tomnyan angers him.
When next to a Merican yo-kai, damage dealt is up.
Conversation after battling (when recruited in Yo-kai Watch 3): "Meya... meow... I battled but was completely defeated, meow... You don't know about, me Tomnyan, I want to know all about you, meow!... I've decided, meow! I'll follow you, meow!"
After receiving his medal: "Starting today we're friends, meow~!"
After Nate & Whisper's responses: "Meow meow meow~!"
"Tomnyan" is a combination of tom (both a male cat and a common male name) and nyan (onomatopoeia for a cat's call). Also, based of a "Tomcat" a cat especially fixed up to breed.
His favorite singer is Lady Nya Nya, who is a parody of Lady Gaga.