- Not to be confused with a character with a similar name.
|“I am from the Brotherhood of Rats, and I am sworn to silence. Do your worst, you'll get nothing out of me, nothing!”|
|— Ritchie, to Lloyd in "The Glitch"|
Ritchie is seen in an interview talking about what it would be like if he could win the Yellow Key-Tana. He soon has to compete with other racers who want the spotlight as well.
When the Ninja and Okino were at the Forest of Discontent, Ritchie attacks Lloyd, and Richie and another Whack Rat attack the others. However, when Ritchie was tied up, Richie and the other Whack Rat escaped.
When Ritchie was questioned by Lloyd, he replies that he was ordered by Unagami to attack the Ninja. Moments later, Ritchie tells Lloyd that he can help the Ninja by showing them a shortcut, a glitch.
After Ritchie was freed and lured the Ninja to a glitch, the Red Visors ambushed the Ninja and attacked them while Ritchie escape.
After Racer Seven reached first place, Ritchie commands Richie and another Whack Rat to go after her. However, he and the other Whack Rats failed when Lloyd, Jay, and Nya collided with them.
Richie was among the A.I. that were freed from Prime Empire through Unagami's Manifestation Gate. He took to terrorizing the streets of Ninjago City along with his fellow Whack Rats. He was then kicked out of his Quad Bike by Zane and had it stolen.
After Unagami aired out his grievances with Milton Dyer, Ritchie, along with the other Whack Rats, decided Ninjago wasn’t for them and went back through the Gate into Prime Empire.
- Like all the other racers in "The Meaning of Victory," he had his name wrong in Ninjargon. In this case, Ritchie's name was Ratsq instead.
- He is called Hausner in the sets but is referred to as Ritchie in the credits and Richie in the show and in synopses. Richie is what another member of the Whack Rats is called in the sets, likely meaning that either the show or the sets mixed up their names.
- Along with Richie, the form of Ritchie is reused many times for generic members of the Whack Rats.
- Although, in the show, the other ones have different coloring and names, with them having a mohawk, orange hands, and purple pants while Hausner has a different ponytail, purple hands, and orange pants.
- He appears in every set that includes the Yellow Key-Tana except 71712 Empire Temple of Madness.