Walter appears in a few spin-offs, Elias' sequel, and a Season 6+ route.

Walter is the current House of Goldstein: a Wizard family that is famous for their creation of various magical tools. Unlike most heads of a family, Walter is kind and genuinely cares for his children. His blue-lilac eyes are sharp and kind, and his sons Elias and Klaus take after him the most in looks. Surprisingly, Walter has a sweet tooth and loves shortcake. According to his nephew (Sigurd), Walter can be a bit too mischievous, going as far as to challenging his children to make a new and original tool within an hour.

In Elias' sequel, he shows up on campus and the protagonist recognizes him from books and newspapers, which implies how famous he is. Apparently he had gone to the Academy to pay his respects to Headmaster Randolph before he retired. After that, he went to visit his youngest son and explained to the protagonist about the 'Initiation,' which is a coming of age ceremony that has been practiced in the House of Goldstein for centuries. Whether it be a powerful magic spell or tool, members of the House of Goldstein are initiated into adulthood once they contribute to society. And, according to Walter, is mandatory for all family members. Although Elias is hesitant to take the test, Walter supports the idea and gives encouragement to Elias. 

He shows up again to inform and congratulate Elias for passing his two initiations. When Klaus shows up to congratulate his brother as well, Walter uses this time to tease Klaus, joking that he never thought about seeing his youngest being engaged before Klaus. Klaus looks at his father, upset by his joke, and Walter stops teasing him claiming even he is afraid of Klaus' angry face. 

Voice: Deep and kind