"Serves you right you little Scheiße."
Otto Holtenwasser is the Murphys' elderly German-Jewish neighbor. Due to his religious background and German nature, the neighborhood children (even Kevin) racially believed him to be Hitler's little brother, a Nazi, who hunted down kids, and the numbered tattoo on his arm is a scoreboard for how many people he has killed. When in reality, he is the opposite of the kids' racial view of him, as he is generally a sweet man to the children who survived the Holocaust. He is voiced by Trevor Devall.
Otto was born in Germany in 1898. It's revealed in The "B" Word that his father had turned him into the Gestapo, causing him to be incarcerated at a concentration camp. During this time, he endured many traumatic events. Eventually, he was liberated and moved to America. Sometime during this period, he met a woman named Mary, who was a U.S. nurse. They married and became the first homeowners of a subdivision on a cul-de-sac. Over time, more people moved into the neighborhood, including the Murphys, the Goomers, the Bonfiglios, and Vic Reynolds. Sometime between 1961 and 1973, Mary passed away, leaving Otto widowed.
Most likely due to words getting twisted about his past, a playground rumor has the kids believing he is a Nazi and therefore are scared of him. Despite this, In "The Bleedin' in Sweden," Bill's magnet gets stuck to the numbers on Holtenwasser's house.
In "The Trough" he gives Kevin a ride home. He recounts to him how he's watched Kevin grow up throughout the years, seeing him playing around the neighborhood. He also mentions that he and his wife were the first homeowners in the subdivision. During this, Kevin notices a Star of David hanging from his rearview mirror but mistakes it for a pentagram. For this reason, Kevin (and later Bill) believes he is a Satan worshipper, even despite Frank's more accurate description of him as "a sad old man whose family was butchered in the war."
In "The Liar's Club," Holtenwasser joins Kevin and Frank and the rest of the neighborhood in the Murphy's basement, remarking he shared a basement with fourteen others in his lifetime. Vic likens this to a life of partying before Holtenwasser reflects it was, really, a very quiet life, "most of the time."
Otto Holtenwasser is a friendly elderly man, who is always generous to his neighbors and especially kind to children. Although 99% of the time, Otto managed to keep a delightful and carefree demeanor, he will occasionally have a sudden change in mood, and abruptly bring up a brief, but detailed event, of what happened to him, during the holocaust, often killing the cheery vibe, that surrounds him.
- The Bleedin' in Sweden
- Saturday, Bloody Saturday
- The Trough
- O Holy Moly Night
- Heavy Sledding
- The Liar's Club
- Night Shift
- This Is Not Good
- Fight Night
- F Is For Fixing It
- Landing The Plane (cameo)
- Are You Ready For The Summer? (cameo)
- Paul Lynde to Block
- The Stinger (cameo)
- Mr. Murphy's Wild Ride
- Battle Of The Sexes
- Punch Drunk
- Summer Vacation
- It's In His Blood
- Frank The Father
- Bill Murphy's Night Off
- Father Confessor
- Nothing Is Impossible
- Bring Me A Tooth (nonspeaking-cameo)
- Mr. Holtenwasser drove Sue to the hospital for Maureen's birth, when Frank got caught up with other predicaments.
- In German, his surname "Holtenwasser" literally translates to "fetched water".
- His serial number is 721437.
- Despite being nice to most kids, he despises Jimmy Fitzsimmons, and he's not afraid to show his darker side and curse at him when he's being bothered by him. In "This Is Not Good", he was happy when he overheard that Jimmy got sent to boot camp.
- In the third season, Mr. Hotlenwasser unintentionally gets roped into a fling with Ginny Throater, who was still recovering from her divorce at the time.