About
Karlstahl is a friend of Lena's father. Ranked commodore. Lena grows disillusioned with him after learning he did nothing despite being aware of the Republic's fault, resulting in her strengthened resolve to walk her chosen path.
(Source: 86 - Eighty Six - Wiki)
Voice Actors

Mikami, Satoshi
Japanese
Catoire, Philippe
French
Williams, Imari
English
Kotulla, Robert
German
Júlio, Ronaldo
Portuguese (BR)