Yokoyama Naoya also known as Rattsu (ラッツ) is a Japanese Super Smash Bros. Ultimate and Wii U player who mains Greninja with Incineroar as his secondary.
Rattsu is currently ranked 80th at the Japan Player Rankings and has competed at tournaments like Karisuma SP4 and Umebura Japan Major 2019. At EVO Japan 2020, he ranked 33rd after defeating players like Brood, Niki, and losing to Shogun.
Rattsu is a fan of the JRPG series, Dragon Quest, and has a dedicated Twitter account for his pet.