- Fritz (Worldwar), a German soldier and minor character in Striking the Balance.
- Fritz (End of the World), a character in "It's the End of the World As We Know It, And We Feel Fine".
- Fritzi (Iron Heart), a German veteran and minor character in The Man With the Iron Heart.
The following characters have Fritz as a first name:
- Fritz-Julius Lemp, a historical German U-boat commander and POV in The War That Came Early series.
- Fritz Gustafson, a fictional US Navy Petty Officer in the Southern Victory series.
- Fritz Pfeffer, a historical dentist referenced in the short story "The Eighth-Grade History Class Visits the Hebrew Home for the Aging".
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