Befriended:"Splendid victory! Allow me to clean up after you!"
Loafing:"Clearing my head."
Being traded:"Do my eyes deceive me? This place...is filthy! I will put it to rights!"
Receiving food (favorite):"That's great!"
Receiving food (normal):"Meh."
Receiving food (disliked):" *hack* EW!"
Washogun first appears in EP050 where he leads an army of Brushido into Nate's house, having been drawn to his desire to clean the house so he can bargain for a bigger allowance from his parents. Having declared a war on filth, Washogun leads the Brushido into making every room spotless. However, the Brushido's work is quickly undone by the presence of the Messyrai, filth-dedicated counterparts to the Brushido. Washogun determines that the Messyrai are being led by a tactical genius of filth, who turns out to be Jibanyan being a slob. Under Nate's order, Washogun and the Brushido meet the Messyrai in an unseen battle that ends with Jibanyan being thrown through the roof.
Washogun's "random" nicknames in Yo-kai Watch 2 are: Eyebrows, Tidy Ted, Milord, and Shiro.
"Arai Masho" is a play on mashō (魔将, "demon general") and the phrase araimashō (洗いましょう, "let's clean up")
"Washogun" is a portmanteau of "wash" and "shogun".
"Samulimpio" is a portmanteau of "Samurai" and "Limpio" (clean)