Trustee (played by Rudolf Hrušínský) is a protagonist in Larks on a String.
Pavel Hvezdár (played by Václav Neckář) appears in Larks on a String.
Jitka (played by Jitka Zelenohorská) appears in Larks on a String.
Professor (played by Vlastimil Brodský) appears in Larks on a String.
Kudla (played by Ferdinand Krůta) appears in Larks on a String.
Mlíkar (played by Vladimír Ptáček) appears in Larks on a String.
Public Prosecutor (played by Leoš Suchařípa) appears in Larks on a String.
Saxophonist (played by Eugen Jegorov) appears in Larks on a String.